too many references in essay

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Is there such thing as too many references for one paper?

I'm currently reviewing a paper that has an uncommonly large number of references compared to the average number for that particular venue (more than 60 versus around 30). This is a regular paper, not a survey one, and although there does not seem to be wrong references, it feels like some are not really necessary, and the fact that one particular author is cited more than 15 times makes me worry that this paper is used to inflate the number of citations of that author (the submission is anonymous).

Should I mention this in my review, and try to examine which submissions are "abusive", or just let it go?

paper-submission
2 Does the journal have a policy on number of references allowed? Many do (mostly print journals), and would force authors to cut down the number of references. – fileunderwater Commented Oct 21, 2013 at 11:13
As far as I know, there is no limit on the number of references, only on the number of pages, which is respected. – user102 Commented Oct 21, 2013 at 11:53
There is probably some discipline influence at work. In the social sciences, it is not uncommon to have around 50 references in a journal paper. – Shion Commented Oct 21, 2013 at 14:20
3 @shion: as I said in the question, the number of references is quite large w.r.t. the average number of references for papers in that venue – user102 Commented Oct 21, 2013 at 14:25
8 I once wrote a paper that contained all references to papers not referencing themselves. That was too many. – Pål GD Commented Oct 21, 2013 at 22:18

6 Answers 6

It's really a judgment call… some people consider that more references is good, because it gives the reader a wider perspective into the issue, and some people consider it a bad practice (in old times because it wasted paper, but nowadays mainly because it obscures the more valuable information inside a long wall of text).

I have, as a reviewer, sometimes asked authors to cut down on the number of references, so it is certainly an acceptable practice. Here are some factors you may consider when making the decision:

Does each individual reference bring something to the paper, i.e. is used to back up a fact, idea, or to give credit for a specific (and relevant) new idea that it introduced?

Are references cited in block? I tend to consider it is very bad practice:

A series of recent experiments have shown systematically that current human-powered aircrafts are not suitable for mass transportation [refs. 9–21]

Each paper (or group of two or three papers, at the very most) should be used with regards to a specific point in the discussion.

Somewhat disguised form of the earlier: are long lists of claims and references justified? Sometimes many citations are used as “examples”, where a few would suffice.

Could some of the citations be replaced by one or two reviews on the topic?

Are the work cited really the seminal work on each topic/idea/experiment, or are there also less “worthy” works cited?

Finally, it is true that there are some unethical practices that can lead to inflated number of citations. Excessive self-citation is certainly one, but there are others. For example, some authors cite very widely papers from all groups in their field , even when it is not really warranted, in an effort to help their chances at peer review: the idea is that the reviewer is less likely to be harsh to a manuscript that cites 5 of her own papers.

And in conclusion, if you believe that self-citation was the motivation, there is nothing wrong with reporting your doubts to the editor.

1 I agree with @F'x. But how we can respond to the reviewers' recommendation to add their papers in the references (as I guess from those recommended papers comes back to special authors only)? – Hadi Commented Sep 13, 2016 at 8:35
1 Blocks of citations are an accepted practice in the physical sciences. There are often multiple papers that make the same point and are published about the same time - they deserve equal citation. – Anonymous Physicist Commented Jan 7, 2021 at 7:52

One 1 thing 2 that 3 hasn't 1,4 been 5-7 mentioned 8 yet 1 is 3-5 the 9 effect 10,11 on 2,7,10 readability. 12 References 13 are 14 a 15 necessity 16 but 17 loading 18 up 19-21 a 22 manuscript 23,24 with 25 too 26 many 2 will 27 often 3-5 make 5-7 it 28 more 9,29-31 difficult 17 for 32 me 33 to 34 follow 35,36 and 37-39 can 40 be 3-5 a 13-15,19,21-23,25-27,29-33,35-37,39,40 deterrent. 41 If 2,3,5,8,13,21,34 a 3,14,15,19,26 paper 2,7,18,28 turns 1,6,18 off 1,4,14,21,35 its 1,7,32 readers, 2,23 it's 4,8,15,16,23,42 not 6,28 doing 1,2,4,8,16,32 its 2,3,5,7,11,13,17,19,23,29,31,37,41 job. 42

14 This answer may be too exaggerated. But, I still like it. – Nobody Commented Oct 22, 2013 at 9:58
11 This answer is an example of the kind of paper that "turns off its reader", should this be downvoted then? – Vaibhav Garg Commented Oct 28, 2013 at 4:00
2 Very Nicely done! – Prof. Santa Claus Commented Jan 24, 2018 at 2:54

I can only see one way to resolve this and that is to critically assess if all references are necessary. Self-citation can be a problem but it may be perfectly fine in situations where the author is a leader in, for example, a small field. Excessive citations can also be a sign of the author not being able to weed out the critical papers from the "mass". In some cases, it may be tempting to provide all the literature found on a particular topic wher perhaps a review paper or relatively new paper summarizing past work could be referenced using the form "(e.g. author, yyyy)", indicating it is one of several possible references on the topic. I think it is perfectly fair to ask for such changes if the excessive referencing is clearly just excessive.

I do not think that there are inherent problems with citing some "extra" papers, if they are appropriately relevant. The purpose of citations is to help us form a network of research. If a paper is not cited, then it will not join that network. However, one does not need to cite every paper that an author has written in the past 5 years in order to maintain that network!

Rather than spend time examining each citation, perhaps you could ask the author why there are so many citations. If the author(s) has been inflating citations without due cause, then any academic worth their salt should promptly correct that indiscretion.

I wonder if the authors considered the question When you reference an article, is it always expected that you have actually read it?

I can imagine multiple likely reasons for the high amount of citations by one particular author:

The over-referenced author is a member of the same group as your paper's authors (or even themselves) and they try to promote their own work. This may be adequate if the cited papers honestly led to the new one, but if they are just loosely related (if at all), the amount of citations should be severely reduced
that author is one of the big-shots in the field, and the submitters either want to acknowledge that fact or they know that person is likely to also review the submission and would insist on these citations anyway - maybe this is actually already the reaction to such requests. And don't say this doesn't happen...

Unfortunately no matter the reason, to judge fairly you basically have to read at least the abstracts of said citations and check their relatedness. However, as F'x' answer suggests, if there are "obvious" signs of over-citation, e.g. block citations of more than, say, three publications, you shouldn't bother with that and rather directly state your concerns in your review.

Once the amount of references surpasses a sensible amount, the authors should maybe more directly justify the citation themselves instead of forcing each reviewer to figure that out on their own...

There should be a Goldilocks-range for this, and what this supposed to be depends on your field, topic (whether relatively new or not), and most importantly, your advisor and thesis committee.

( Image ref. PhDComics. )

What references are for : to justify statements only, including background. When should one put references : when making a statement which needs justification not provided in the article. When not to tolerate multiple references : - Careless scattergun references "on the topic". - Reference stuff to boost citation indices. Why is this important : - Because a paper which does not reference precisely is a waste of the reader's time. - Because boosting citations is wrong. Multiple references may be acceptable only if there are independent angles to reference. – JPGConnolly Commented Jan 23, 2023 at 15:30

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How often should you reference?

(Last updated: 14 February 2019)

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Essay referencing can be a headache at university. How many references do you need? When should you use a reference? Should you use references even when you haven't used a direct quotation? How many references are too many? By knowing how to reference properly, you can reduce the stress involved in your essay writing .

To help make essay referencing easier, we've tackled a few of those niggling questions that should make the process a little smoother.

Why does referencing matter?

Including references in your essay is your way to show your markers that you've truly engaged with your subject matter. It is also important as it proves that you've read the key sources which relate to your topic. They additionally show that you've thought carefully about how each source relates to the subject you're writing about. The more helpful references you include, the more well-informed you appear to be about your topic. It’s not always about quantity, either. Quality sources which really inform your essay are really worth including.

Including a bibliography is good academic practice. If you go on to study further, write more about your subject or publish your work, giving kudos to the writers whose work you took information and inspiration from is essential. A bibliography also provides a helpful resource you can go back to and use for future work.

How many references is too many references?

Of course, it is possible to use too many references . If you are using references just to show off all the books you've read, this will be obvious and will not impress your markers. You need to choose the sources which really contribute to your essay; supporting your argument, contesting it or prompting interesting, relevant questions.

Remember, markers also want to see evidence of your own, original thinking. Using too many references does not leave much room for your personal standpoint to shine through. As a general rule, you should aim to use one to three, to support each key point you make. This of course depends on subject matter and the point you are discussing, but acts as a good general guide. It can be useful to have a best practice breakdown of your essay to help you work out how many references to use. Here's a rough guide to help you get the balance right for any piece of academic work:

Introduction

Your introduction should make up approximately 10% of your essay. You may want to use one or two references to define your topic in this section, depending on your word count.
The main body of your essay (which will include the key points in your argument ) should make up approximately 75% of your essay. For example: In a 2000 word essay, you will have 1500 words to use. Each main point you make should typically use 1-3 paragraphs, which should average around 200-400 words in total. This will give you room for around 5 key points, each supported by 2 or 3 references. Try and use direct or primary references where possible. Sometimes you’ll need to use in-text references, too.
Your conclusion should account for around 15% of your essay. You may wish to use 1-3 references to lend authority to your concluding statements. Of course, it is really hard to suggest exactly how many references your essay should include. This depends totally on the subject matter and word count. A Philosophy essay, for example, may have a lot of critical thinking and be quite theory-heavy, and for this reason you may need more references than a typical English Literature Essay. This is just an example – you’ll need to consider your own subject matter and topic.

When to use references

References aren't just used to give credit for quotations. They can be used to indicate that an idea, concept, fact or theory has come directly from a particular reference. Other instances when references must be used include:

Illustrations

And if you've used any information or ideas from:

Computer programmes
Any external source

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Appropriate Level of Citation

The number of sources you cite in your paper depends on the purpose of your work. For most papers, cite one or two of the most representative sources for each key point. Literature review papers, however, typically include a more exhaustive list of references.

Provide appropriate credit to the source (e.g., by using an in-text citation) whenever you do the following:

paraphrase (i.e., state in your own words) the ideas of others
directly quote the words of others
refer to data or data sets
reprint or adapt a table or figure, even images from the internet that are free or licensed in the Creative Commons
reprint a long text passage or commercially copyrighted test item

Avoid both undercitation and overcitation. Undercitation can lead to plagiarism and/or self-plagiarism . Overcitation can be distracting and is unnecessary.

For example, it is considered overcitation to repeat the same citation in every sentence when the source and topic have not changed. Instead, when paraphrasing a key point in more than one sentence within a paragraph, cite the source in the first sentence in which it is relevant and do not repeat the citation in subsequent sentences as long as the source remains clear and unchanged.

Figure 8.1 in Chapter 8 of the Publication Manual provides an example of an appropriate level of citation.

Determining the appropriate level of citation is covered in the seventh edition APA Style manuals in the Publication Manual Section 8.1 and the Concise Guide Section 8.1

Related handouts

In-Text Citation Checklist (PDF, 227KB)
Six Steps to Proper Citation (PDF, 112KB)

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How to Reference in an Essay (9 Strategies of Top Students)

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Dr. Chris Drew is the founder of the Helpful Professor. He holds a PhD in education and has published over 20 articles in scholarly journals. He is the former editor of the Journal of Learning Development in Higher Education. [Image Descriptor: Photo of Chris]

Learn about our Editorial Process

Are you feeling overwhelmed by referencing?

When you’re first asked to do referencing in an essay it can be hard to get your head around it. If it’s been a while since you were first taught how to reference, it can be intimidating to ask again how to do it!

I have so many students who consistently lose marks just because they didn’t get referencing right! They’re either embarrassed to ask for extra help or too lazy to learn how to solve the issues.

So, here’s a post that will help you solve the issues on your own.

Already think you’re good at referencing? No worries. This post goes through some surprising and advanced strategies for anyone to improve no matter what level you are at!

In this post I’m going to show you exactly how to reference in an essay. I’ll explain why we do it and I’ll show you 9 actionable tips on getting referencing right that I’m sure you will not have heard anywhere else!

The post is split into three parts:

What is a Reference and What is a Citation?
Why Reference? (4 Things you Should Know)
How to Reference (9 Strategies of Top Students)

If you think you’ve already got a good understanding of the basics, you can jump to our 9 Advanced Strategies section.

Part 1: What is a Reference and What is a Citation?

What is a citation.

An in-text mention of your source. A citation is a short mention of the source you got the information from, usually in the middle or end of a sentence in the body of your paragraph. It is usually abbreviated so as not to distract the reader too much from your own writing. Here’s two examples of citations. The first is in APA format. The second is in MLA format:

APA: Archaeological records trace the original human being to equatorial Africa about 250,000–350,000 years ago (Schlebusch & Jakobsson, 2018) .
MLA: Archaeological records trace the original human being to equatorial Africa about 250,000–350,000 years ago (Schlebusch and Jakobsson 1) .

In APA format, you’ve got the authors and year of publication listed. In MLA format, you’ve got the authors and page number listed. If you keep reading, I’ll give some more tips on formatting further down in this article.

And a Reference is:

What is a Reference?

A reference is the full details of a source that you list at the end of the article. For every citation (see above) there needs to be a corresponding reference at the end of the essay showing more details about that source. The idea is that the reader can see the source in-text (i.e. they can look at the citation) and if they want more information they can jump to the end of the page and find out exactly how to go about finding the source.

Here’s how you would go about referencing the Schlebusch and Jakobsson source in a list at the end of the essay. Again, I will show you how to do it in APA and MLA formats:

APA: Schlebusch, C. & Jakobsson, M. (2018). Tales of Human Migration, Admixture, and Selection in Africa. Annual Review of Genomics and Human Genetics , 11 (33), 1–24.
MLA: Schlebusch, Carina and Mattias Jakobsson. “Tales of Human Migration, Admixture, and Selection in Africa.” Annual Review of Genomics and Human Genetics , vol. 11, no. 33, 2018, pp. 1–24.

In strategy 1 below I’ll show you the easiest and fool proof way to write these references perfectly every time.

One last quick note: sometimes we say ‘reference’ when we mean ‘citation’. That’s pretty normal. Just roll with the punches. It’s usually pretty easy to pick up on what our teacher means regardless of whether they use the word ‘reference’ or ‘citation’.

Part 2: Why Reference in an Essay? (4 Things you Should Know)

Referencing in an essay is important. By the time you start doing 200-level courses, you probably won’t pass the course unless you reference appropriately. So, the biggest answer to ‘why reference?’ is simple: Because you Have To!

Okay let’s be serious though … here’s the four top ‘real’ reasons to reference:

1. Referencing shows you Got an Expert’s Opinion

You can’t just write an essay on what you think you know. This is a huge mistake of beginning students. Instead this is what you need to do:

Top Tip: Essays at university are supposed to show off that you’ve learned new information by reading the opinions of experts.

Every time you place a citation in your paragraph, you’re showing that the information you’re presenting in that paragraph was provided to you by an expert. In other words, it means you consulted an expert’s opinion to build your knowledge.

If you have citations throughout the essay with links to a variety of different expert opinions, you’ll show your marker that you did actually genuinely look at what the experts said with an open mind and considered their ideas.

This will help you to grow your grades.

2. Referencing shows you read your Assigned Readings

Your teacher will most likely give you scholarly journal articles or book chapters to read for homework between classes. You might have even talked about those assigned readings in your seminars and tutorials.

Great! The assigned readings are very important to you.

You should definitely cite the assigned readings relevant to your essay topic in your evaluative essay (unless your teacher tells you not to). Why? I’ll explain below.

Firstly, the assigned readings were selected by your teacher because your teacher (you know, the person who’s going to mark your essay) believes they’re the best quality articles on the topic. Translation: your teacher gave you the best source you’re going to find. Make sure you use it!
Secondly, by citing the assigned readings you are showing your teacher that you have been paying attention throughout the course. You are showing your teacher that you have done your homework, read those assigned readings and paid attention to them. When my students submit an essay that has references to websites, blogs, wikis and magazines I get very frustrated. Why would you cite low quality non-expert sources like websites when I gave you the expert’s article!? Really, it frustrates me so, so much.

So, cite the assigned readings to show your teacher you read the scholarly articles your teacher gave to you. It’ll help you grow your marks.

3. Referencing deepens your Knowledge

Okay, so you understand that you need to use referencing to show you got experts’ opinions on the topic.

But there’s more to it than that. There’s actually a real benefit for your learning.

If you force yourself to cite two expert sources per paragraph, you’re actually forcing yourself to get two separate pieces of expert knowledge. This will deepen your knowledge!

So, don’t treat referencing like a vanity exercise to help you gain more marks. Actually view it as an opportunity to develop deeper understandings of the topic!

When you read expert sources, aim to pick up on some new gems of knowledge that you can discuss in your essays. Some things you should look out for when finding sources to reference:

Examples that link ideas to real life. Do the experts provide real-life examples that you can mention in your essay?
Facts and figures. Usually experts have conducted research on a topic and provide you with facts and figures from their research. Use those facts and figures to deepen your essay!
Short Quotes. Did your source say something in a really interesting, concise or surprising way? Great! You can quote that source in your essay .
New Perspectives. Your source might give you another perspective, angle or piece of information that you can add to your paragraph so that it’s a deep, detailed and interesting paragraph.

So, the reason we ask you to reference is at the end of the day because it’s good for you: it helps you learn!

4. Referencing backs up your Claims

You might think you already know a ton of information about the topic and be ready to share your mountains of knowledge with your teacher. Great!

So, should you still reference?

Yes. Definitely.

You need to show that you’re not the only person with your opinion. You need to ‘stand on the shoulders of giants.’ Show what other sources have said about your points to prove that experts agree with you.

You should be saying: this is my opinion and it’s based on facts, expert opinions and deep, close scrutiny of all the arguments that exist out there .

If you make a claim that no one else has made, your teacher is going to be like “Have you even been reading the evidence on this topic?” The answer, if there are no citations is likely: No. You haven’t.

Even if you totally disagree with the experts, you still need to say what their opinions are! You’ll need to say: “This is the experts’ opinions. And this is why I disagree.”

So, yes, you need to reference to back up every claim. Try to reference twice in every paragraph to achieve this.

Part 3: Strategies for How to Reference in an Essay (9 Strategies of Top Students)

Let’s get going with our top strategies for how to reference in an essay! These are strategies that you probably haven’t heard elsewhere. They work for everyone – from beginner to advanced! Let’s get started:

1. Print out your Reference Style Cheat Sheet

Referencing is hard and very specific. You need to know where to place your italics, where the commas go and whether to use an initial for full name for an author.

There are so many details to get right.

And here’s the bad news: The automated referencing apps and websites nearly always get it wrong! They tell you they can generate the citation for you. The fact of the matter is: they can’t!

Here’s the best way to get referencing right: Download a referencing cheat sheet and have it by your side while writing your essay.

Your assignment outline should tell you what type of referencing you should use. Different styles include: APA Style, MLA Style, Chicago Style, Harvard Style, Vancouver Style … and many more!

You need to find out which style you need to use and download your cheat sheet. You can jump onto google to find a cheat sheet by typing in the google bar:

Download a pdf version of the referencing style cheat sheet, print it out, and place it on your pinboard or by your side when writing your essay.

2. Only cite Experts

There are good and bad sources to cite in an essay.

You should only cite sources written, critiqued and edited by experts. This shows that you have got the skill of finding information that is authoritative. You haven’t just used information that any old person popped up on their blog. You haven’t just gotten information from your local newspaper. Instead, you got information from the person who is an absolute expert on the topic.

Here’s an infographic listing sources that you should and shouldn’t cite. Feel free to share this infographic on social media, with your teachers and your friends:

3. Always use Google Scholar

Always. Use. Google. Scholar.

Ten years ago students only had their online university search database to find articles. Those university databases suck. They rarely find the best quality sources and there’s always a big mix of completely irrelevant sources mixed in there.

Google Scholar is better at finding the sources you want. That’s because it looks through the whole article abstract and analyses it to see if it’s relevant to your search keywords. By contrast, most university search databases rely only on the titles of articles.

Use the power of the best quality search engine in the world to find scholarly sources .

Note: Google and Google Scholar are different search engines.

To use Google Scholar, go to: https://scholar.google.com

Then, search on google scholar using keywords. I’m going to search keywords for an essay on the topic: “What are the traits of a good nurse?”

If you really like the idea of that first source, I recommend copying the title and trying your University online search database. Your university may give you free access.

4. Cite at least 50% sources you found on your Own Research

Okay, so I’ve told you that you should cite both assigned readings and readings you find from Google Scholar.

Here’s the ideal mix of assigned sources and sources that you found yourself: 50/50.

Your teacher will want to see that you can use both assigned readings and do your own additional research to write a top essay . This shows you’ve got great research skills but also pay attention to what is provided in class.

I recommend that you start with the assigned readings and try to get as much information out of them, then find your own additional sources beyond that using Google Scholar.

So, if your essay has 10 citations, a good mix is 5 assigned readings and 5 readings you found by yourself.

5. Cite Newer Sources

As a general rule, the newer the source the better .

The best rule of thumb that most teachers follow is that you should aim to mostly cite sources from the past 10 years . I usually accept sources from the past 15 years when marking essays.

However, sometimes you have a really great source that’s 20, 30 or 40 years old. You should only cite these sources if they’re what we call ‘seminal texts’. A seminal text is one that was written by an absolute giant in your field and revolutionized the subject.

Here’s some examples of seminal authors whose old articles you would be able to cite despite the fact that they’re old:

Education: Vygotsky, Friere, Piaget
Sociology: Weber, Marx, C. Wright Mills
Psychology: Freud, Rogers, Jung

Even if I cite seminal authors, I always aim for at least 80% of my sources to have been written in the past 10 years.

6. Reference twice per Paragraph

How much should you reference?

Here’s a good strategy: Provide two citations in every paragraph in the body of the essay.

It’s not compulsory to reference in the introduction and conclusion . However, in all the other paragraphs, aim for two citations.

Let’s go over the key strategies for achieving this:

These two citations should be to different sources, not the same sources twice;
Two citations per paragraph shows your points are backed up by not one, but two expert sources;
Place one citation in the first half of the paragraph and one in the second half. This will indicate to your marker that all the points in the whole paragraph are backed up by your citations.

This is a good rule of thumb for you when you’re not sure when and how often to reference. When you get more confident with your referencing, you can mix this up a little.

7. The sum total of your sources should be minimum 1 per 150 words

You can, of course, cite one source more than once throughout the essay. You might cite the same source in the second, fourth and fifth paragraphs. That’s okay.

Essay Writing Tip: Provide one unique citation in the reference list for every 150 words in the essay.

But, you don’t want your whole essay to be based on a narrow range of sources. You want your marker to see that you have consulted multiple sources to get a wide range of information on the topic. Your marker wants to know that you’ve seen a range of different opinions when coming to your conclusions.

When you get to the end of your essay, check to see how many sources are listed in the end-text reference list. A good rule of thumb is 1 source listed in the reference list per 150 words. Here’s how that breaks down by essay size:

1500 word essay: 10 sources (or more) listed in the reference list
2000 word essay: 13 sources (or more) listed in the reference list
3000 word essay: 20 sources (or more) listed in the reference list
5000 word essay: 33 sources (or more) listed in the reference list

8. Instantly improve your Reference List with these Three Tips

Here’s two things you can do to instantly improve your reference list. It takes less than 20 seconds and gives your reference list a strong professional finish:

a) Ensure the font size and style are the same

You will usually find that your whole reference list ends up being in different font sizes and styles. This is because you tend to copy and paste the titles and names in the citations from other sources. If you submit the reference list with font sizes and styles that are not the same as the rest of the essay, the piece looks really unprofessional.

So, quickly highlight the whole reference list and change its font to the same font size and style as the rest of your essay. The screencast at the end of Step 8 walks you through this if you need a hand!

b) List your sources in alphabetical order.

Nearly every referencing style insists that references be listed in alphabetical order. It’s a simple thing to do before submitting and makes the piece look far more professional.

If you’re using Microsoft Word, simply highlight your whole reference list and click the A>Z button in the toolbar. If you can’t see it, you need to be under the ‘home’ tab (circled below):

You’ve probably never heard of a hanging indent. It’s a style where the second line of the reference list is indented further from the left-hand side of the page than the first line. It’s a strategy that’s usually used in reference lists provided in professional publications.

If you use the hanging indent, your reference list will look far more professional.

Here’s a quick video of me doing it for you:

9. Do one special edit especially for Referencing Style

The top students edit their essays three to five times spaced out over a week or more before submitting. One of those edits should be specifically for ensuring your reference list adheres to the referencing style that your teacher requires.

To do this, I recommend you get that cheat sheet printout that I mentioned in Step 1 and have it by your side while you read through the piece. Pay special attention to the use of commas, capital letters, brackets and page numbers for all citations. Also pay attention to the reference list: correct formatting of the reference list can be the difference between getting the top mark in the class and the fifth mark in the class. At the higher end of the marking range, things get competitive and formatting of the reference list counts.

A Quick Summary of the 9 Top Strategies…

Follow the rules of your referencing style guide (and that cheat sheet I recommended!) and use the top 9 tips above to improve your referencing and get top marks. Not only will your referencing look more professional, you’ll probably increase the quality of the content of your piece as well when you follow these tips!

Here’s a final summary of the 9 top tips:

Strategies for How to Reference in an Essay (9 Strategies of Top Students)

Print out your Reference Style Cheat Sheet
Only cite Experts
Always use Google Scholar
Cite at least 50% sources you found on your Own Research
Cite Newer Sources
Reference twice per Paragraph
The sum total of your sources should be minimum 1 per 150 words
Instantly improve your Reference List with these Three Tips
Do one special edit especially for Referencing Style

Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ 19 Top Cognitive Psychology Theories (Explained)
Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ 119 Bloom’s Taxonomy Examples
Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ All 6 Levels of Understanding (on Bloom’s Taxonomy)
Chris Drew (PhD) https://helpfulprofessor.com/author/chris-drew-phd/ 15 Self-Actualization Examples (Maslow's Hierarchy)

How Many References Should I have in an Essay?

Some teachers provide suggested guidelines for how many sources they want to see cited needed in an essay. If this is the case, students should follow this strictly. If teachers haven’t mentioned anything specifically, students should aim to hit around 6-8 references for every 1,000 words of content. This works to about 1 reference for every 200 words or roughly about 1 reference in each paragraph.

However, this is a general rule and should be considered the bare minimum. We’re not saying that every single paragraph of your assignment should have at least 1 reference. Instead, you need to consider the focus of references based on the subsection of the paper. It is important that you do not stuff in your references all in one place. You shouldn’t also make a conscious effort spread them throughout every section of your paper either . You should add in references organically where it would be needed by putting yourself in the shoes of the reader.

For instance, the literature review section is almost always going to need a higher focus on references . This is because the aim of this section is to establish existing ideas within your chosen topic. This in turn requires citations to the existing sources.

On the other hand, the findings, discussions, and conclusion sections are only going to need a moderate focus on references . These sections require you to make your own inferences based on the material you have researched. You should have partially covered the theoretical background for these in the previous sections. Hence there is a relatively lower need to cite sources here unless you are trying to further support your own findings and conclusions.

As we have mentioned in our guide on how to make introduction and conclusions for assignments, the conclusion section must not have new information that you haven’t covered (even if just partially) in the other sections. Instead, you should use this section to go over the key points to emphasize their implications further. In other words, you should not have any external references in the conclusions section .

Table of Contents

Can you use too many references in an essay?

Yes, having an excessive amount of references in-text dilutes the quality of your paper. Doing this is going to make your paper seem like a very long literature review. Instead, your professors want to see that you have read through existing literature and engaged with it to form your own ideas. We cover in this some detail in our guides on how to prepare a literature review and how to critically analyze information.

Having said that, it is generally better to have too many references as compared to too few sources cited. While both approaches are not ideal, in case of over-citing with proper interlinking of the points from different sources), it shows that you have taken the effort to look up multiple sources. So, while you would have fewer original ideas in this case, the actual content should be of a high quality.

On the other hand, having too few references gives the impression that you probably wrote the paper at the last minute. When we don’t rely on enough external sources, we are likely to end up with generic statements or going off on a tangent.

So, to get an idea of how many citations is too many, you should ask yourself the question of whether you have been able to include enough original content of your own as well. If you’re dealing with a topic which has multiple viewpoints with arguments and counterarguments for each, then it is fine to even have even two or three references clustered together in consecutive sentences. However, just make sure that you follow up these consecutive referenced sentences with what you have inferred from them.

How many times can you cite one source?

You can cite the same source multiple times, as long as you do it the right way, without making it seem like you have relied too heavily on the same source. Teachers expect to see that you have tried to explore different viewpoints on an issue. Simply citing the same sources over and over could make you susceptible to the same biases of those authors.

How do you reference the same author multiple times?

If you’re following the standard Chicago style , when citing the same source consecutively, the use of the word ‘Ibid’ is typically recommended. This word comes from the Latin word ‘ibidem’ which conveys the meaning of ‘in the same place’.

However, it is worth noting that the Chicago 17 th Edition does not favor the use of ‘Ibid’ and instead recommends shortened citations.

Other referencing styles like Harvard and MLA do not recommend the use of ‘Ibid’ and instead encourage shortened references instead. In the APA style, there is no specific recommendation to use ‘Ibid’ either. If you’re following one of these three referencing styles, then you don’t necessarily have to repeat the in-text reference for the source in each sentence. You just need to make it clear that you’re referencing the same source again.

Should Ibid be italicized?

The general consensus in academic circles at present is that foreign words which are used commonly do not need to be italicized. This includes Latin words like ibid., et al., passim, fait accompli and de facto, so you do not need to italicize these words.

Is there a comma after Ibid?

You should follow up the word ‘Ibid’ with a comma and include the page number if you have to be referencing different pages of the same source. If not, then there’s no need to have a comma after Ibid.

Can you have two citations in one sentence?

Yes, you can have two or more citations in one sentence. However, if you if do this, take care to phrase the sentence properly. To avoid making the sentence too long, you can break up the citations as shown below. Alternatively, you can potentially combine the references in parentheses as explained in the next section.

How do you cite two or more references within the same parentheses?

If you want to cite multiple references within the same parentheses, you should separate them by using a semi colon (;) in between. This is shown in the following example in which two closely related points from different sources are combined together.

Calculator for number of References Needed

Here’s a calculator to get a ballpark estimate of the number and type of references which you need for your assignment. Please follow the instructions below to get an idea of how to use this calculator.

Nandakumar, M. K., Ghobadian, A., & O’Regan, N. (2010). Business‐level strategy and performance: The moderating effects of environment and structure. Management Decision . 48(6), 907-939.

Porter, M. E. (1979). How Competitive Forces Shape Strategy. Harvard Business Review [Online]. Available from: https://hbr.org/1979/03/how-competitive-forces-shape-strategy [Accessed 14 November 2021]

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How many references should I have?

Use as many references as you need You’ll need an appropriate amount for your academic level – this will vary

Reference everything you cite If you use an idea, cite and reference it

Ask your tutor They may have guidance for you on how much reading they expect you to do

Students sometimes worry that there is an optimum number of references that they need to cite.

There’s no right or wrong answer answer as to how many references you need – it depends on how many you’ve cited in your writing!

The most important thing is that you don’t plagiarise. Make sure you include references for everything that you’ve cited in the text, so that it’s clear where your information has come from.

Depending on what you’re writing, you might have only a few. As long as they are appropriate for your level of study, and you have enough evidence to back your arguments, you shouldn’t worry. Lab reports, for example, might have relatively few references because you are writing up work that you have done in the labs.

You can also look at the marking criteria for your assignment as that might indicate on what is or isn’t sufficient. If in doubt, check with whoever set you the work as they might be able to give you a clearer idea.

Remember, you are looking to provide proof that you have done the research. Citations and referencing point your readers to the sources you have used in your research process.

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Knowledge Base
Citing sources

How to Cite Sources | Citation Generator & Quick Guide

Citing your sources is essential in academic writing . Whenever you quote or paraphrase a source (such as a book, article, or webpage), you have to include a citation crediting the original author.

Failing to properly cite your sources counts as plagiarism , since you’re presenting someone else’s ideas as if they were your own.

The most commonly used citation styles are APA and MLA. The free Scribbr Citation Generator is the quickest way to cite sources in these styles. Simply enter the URL, DOI, or title, and we’ll generate an accurate, correctly formatted citation.

Generate accurate citations with Scribbr

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When do you need to cite sources, which citation style should you use, in-text citations, reference lists and bibliographies.

Scribbr Citation Generator

Other useful citation tools

Citation examples and full guides, frequently asked questions about citing sources.

Citations are required in all types of academic texts. They are needed for several reasons:

To avoid plagiarism by indicating when you’re taking information from another source
To give proper credit to the author of that source
To allow the reader to consult your sources for themselves

A citation is needed whenever you integrate a source into your writing. This usually means quoting or paraphrasing:

To quote a source , copy a short piece of text word for word and put it inside quotation marks .
To paraphrase a source , put the text into your own words. It’s important that the paraphrase is not too close to the original wording. You can use the paraphrasing tool if you don’t want to do this manually.

Citations are needed whether you quote or paraphrase, and whatever type of source you use. As well as citing scholarly sources like books and journal articles, don’t forget to include citations for any other sources you use for ideas, examples, or evidence. That includes websites, YouTube videos , and lectures .

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Usually, your institution (or the journal you’re submitting to) will require you to follow a specific citation style, so check your guidelines or ask your instructor.

In some cases, you may have to choose a citation style for yourself. Make sure to pick one style and use it consistently:

APA Style is widely used in the social sciences and beyond.
MLA style is common in the humanities.
Chicago notes and bibliography , common in the humanities
Chicago author-date , used in the (social) sciences
There are many other citation styles for different disciplines.

If in doubt, check with your instructor or read other papers from your field of study to see what style they follow.

In most styles, your citations consist of:

Brief in-text citations at the relevant points in the text
A reference list or bibliography containing full information on all the sources you’ve cited

In-text citations most commonly take the form of parenthetical citations featuring the last name of the source’s author and its year of publication (aka author-date citations).

An alternative to this type of in-text citation is the system used in numerical citation styles , where a number is inserted into the text, corresponding to an entry in a numbered reference list.

There are also note citation styles , where you place your citations in either footnotes or endnotes . Since they’re not embedded in the text itself, these citations can provide more detail and sometimes aren’t accompanied by a full reference list or bibliography.

(London: John Murray, 1859), 510.

A reference list (aka “Bibliography” or “Works Cited,” depending on the style) is where you provide full information on each of the sources you’ve cited in the text. It appears at the end of your paper, usually with a hanging indent applied to each entry.

The information included in reference entries is broadly similar, whatever citation style you’re using. For each source, you’ll typically include the:

Author name
Publication date
Container (e.g., the book an essay was published in, the journal an article appeared in)
Location (e.g., a URL or DOI , or sometimes a physical location)

The exact information included varies depending on the source type and the citation style. The order in which the information appears, and how you format it (e.g., capitalization, use of italics) also varies.

Most commonly, the entries in your reference list are alphabetized by author name. This allows the reader to easily find the relevant entry based on the author name in your in-text citation.

In numerical citation styles, the entries in your reference list are numbered, usually based on the order in which you cite them. The reader finds the right entry based on the number that appears in the text.

Prevent plagiarism. Run a free check.

Because each style has many small differences regarding things like italicization, capitalization , and punctuation , it can be difficult to get every detail right. Using a citation generator can save you a lot of time and effort.

Scribbr offers citation generators for both APA and MLA style. Both are quick, easy to use, and 100% free, with no ads and no registration required.

Just input a URL or DOI or add the source details manually, and the generator will automatically produce an in-text citation and reference entry in the correct format. You can save your reference list as you go and download it when you’re done, and even add annotations for an annotated bibliography .

Once you’ve prepared your citations, you might still be unsure if they’re correct and if you’ve used them appropriately in your text. This is where Scribbr’s other citation tools and services may come in handy:

Plagiarism Checker

Citation Checker

Citation Editing

Plagiarism means passing off someone else’s words or ideas as your own. It’s a serious offense in academia. Universities use plagiarism checking software to scan your paper and identify any similarities to other texts.

When you’re dealing with a lot of sources, it’s easy to make mistakes that could constitute accidental plagiarism. For example, you might forget to add a citation after a quote, or paraphrase a source in a way that’s too close to the original text.

Using a plagiarism checker yourself before you submit your work can help you spot these mistakes before they get you in trouble. Based on the results, you can add any missing citations and rephrase your text where necessary.

Try out the Scribbr Plagiarism Checker for free, or check out our detailed comparison of the best plagiarism checkers available online.

Scribbr Plagiarism Checker

Scribbr’s Citation Checker is a unique AI-powered tool that automatically detects stylistic errors and inconsistencies in your in-text citations. It also suggests a correction for every mistake.

Currently available for APA Style, this is the fastest and easiest way to make sure you’ve formatted your citations correctly. You can try out the tool for free below.

If you need extra help with your reference list, we also offer a more in-depth Citation Editing Service.

Our experts cross-check your in-text citations and reference entries, make sure you’ve included the correct information for each source, and improve the formatting of your reference page.

If you want to handle your citations yourself, Scribbr’s free Knowledge Base provides clear, accurate guidance on every aspect of citation. You can see citation examples for a variety of common source types below:

And you can check out our comprehensive guides to the most popular citation styles:

At college level, you must properly cite your sources in all essays , research papers , and other academic texts (except exams and in-class exercises).

Add a citation whenever you quote , paraphrase , or summarize information or ideas from a source. You should also give full source details in a bibliography or reference list at the end of your text.

The exact format of your citations depends on which citation style you are instructed to use. The most common styles are APA , MLA , and Chicago .

The abbreviation “ et al. ” (Latin for “and others”) is used to shorten citations of sources with multiple authors.

“Et al.” is used in APA in-text citations of sources with 3+ authors, e.g. (Smith et al., 2019). It is not used in APA reference entries .

Use “et al.” for 3+ authors in MLA in-text citations and Works Cited entries.

Use “et al.” for 4+ authors in a Chicago in-text citation , and for 10+ authors in a Chicago bibliography entry.

The Scribbr Citation Generator is developed using the open-source Citation Style Language (CSL) project and Frank Bennett’s citeproc-js . It’s the same technology used by dozens of other popular citation tools, including Mendeley and Zotero.

You can find all the citation styles and locales used in the Scribbr Citation Generator in our publicly accessible repository on Github .

APA format is widely used by professionals, researchers, and students in the social and behavioral sciences, including fields like education, psychology, and business.

Be sure to check the guidelines of your university or the journal you want to be published in to double-check which style you should be using.

MLA Style is the second most used citation style (after APA ). It is mainly used by students and researchers in humanities fields such as literature, languages, and philosophy.

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IOE - Faculty of Education and Society

Referencing and avoiding plagiarism

Learn how to reference effectively, paraphrase correctly and avoid plagiarism.

Reference effectively and avoid plagiarism

Avoiding plagiarism for beginners, paraphrasing for beginners, referencing faqs, ucl plagiarism guidelines, how should i reference at ioe.

At IOE you will usually need to use a version of APA or Harvard. These are two systems that use in-text referencing (not footnotes). The two systems are very similar. The most important aspect is to be consistent, and to use the same format for all your references. The following UCL Library open resources provides an overview on managing references, how to reference and avoid plagiarism:

References, citations and avoiding plagiarism
How to reference using Harvard style
How to reference using APA style

Guidance on using other referencing styles is available, too.

Reference managers

Many students prefer to use a reference management software . Although there are many packages available, the IOE Library provides LibGuide instructions for the following:

N.B. Please try to understand the ideas behind referencing and discussing different authors' ideas in your work. If you do not have time to do that, you can follow this beginner's guide.

You may stop after any of these steps, and you will have successfully avoided plagiarism. To fully develop your writing, you will probably prefer to progress through as many steps as you can.

Step 1: Direct Quotation

Find the idea that you want to include.
Write this idea in direct quotes.
Add the author’s name and page number.
Put the full reference at the end of your document, to make sure you remember to include it.
You have avoided plagiarism. Stop here, or continue to Step 2, to develop your writing further.

Universities also place the burden of understanding plagiarism and attribution conventions on students. There are myriad information-laden web-based self-help tutorials and workshops on related sites for the universities in this study. Many are excellent resources and can be helpful. Nevertheless, the lack of additional, detailed individual assistance about the techniques of engaging in academic writing conventions, particularly for students studying in off-campus or distance modes, raises issues of equity for plagiarism management policymakers. (Sutherland-Smith, 2010:9).

References: Sutherland-Smith, W. (2010) "Retribution, deterrence and reform: the dilemmas of plagiarism management in universities", Journal of Higher Education Policy and Management , 32(1) 5-16. Available at Taylor and Francis Online (Accessed on 11 January 2019).

Step 2: Paraphrase

Decide what the key information is, for the purposes of your discussion.
Change the order of the ideas and the words. This can help you to emphasise your interpretation of the original text.
Change the word form/grammatical form if necessary.
Use synonyms if appropriate, but do not change any specific terminology. In the example below, terms such as 'plagiarism management', 'universities', 'students' and 'distance' were not changed. The best place to find suitable synonyms will be elsewhere in the same article.
If some words stay the same in the same order (three or more consecutive words), you need to use quotation marks around these words.
Repeat the author's name or a pronoun through the paraphrase, so it is clear that we are still reading a paraphrase.
Add a detail about where the information came from, if necessary. Here, the information 'through her study of eighteen policies on plagiarism from different universities' was added, to give some context to the claims.
Keep the author name and page number (you may have been told that you do not need the page number for a paraphrase, but if the idea came from one specific page, it is still useful to include it. That way, you can check the information again if you need to.)
You have avoided plagiarism. Stop here, or continue to Step 3, to develop your writing further.

Step 3: Add your own examples (optional)

Do you have any examples of what is being discussed? These could be from your own practice or professional experience; from observations you have made; from other literature or published materials.

Include an example with a phrase such as 'To illustrate...' or 'An example of this can be seen in...'
Include the reference if your example is from published materials.
You have avoided plagiarism. Stop here, or continue to Step 4, to develop your writing further.

The responsibility for learning how to reference correctly and avoid plagiarism tends to be passed from the university to the students, as Sutherland-Smith (2010:9) found, through her study of eighteen policies on plagiarism from different universities. She points out that many universities provide self-access resources for students to try to learn more about this area. An example of this can be found on the website “Writing Centre Online” (UCL Institute of Education, 2019), which includes a “Beginners Guide” page with step-by-step instructions on avoiding plagiarism, as well as various links to referencing and plagiarism resources . Despite this type of provision, Sutherland-Smith observes, the support provided is, on the whole, inadequate. Sutherland-Smith expands further to explain that this inadequacy is partly because the advice provided is not specific enough for each student, and partly because distance students will often receive even less support. She concludes that these issues carry implications for the decisions around plagiarism management, as some students may receive more assistance than others, leading to questions of inequity.

Step 4: Add your own comment (Optional)

Do you have any comments on the ideas? These could be:

To support the ideas.
To suggest the ideas are not valid.
To show how the ideas connect to something else.
To comment on the context.
To add another critical comment.

Make sure it is clear, through the language you use, which is your comment, and which is the original paraphrase.

See the section on criticality for more ideas: Criticality

The responsibility for learning how to reference correctly and avoid plagiarism tends to be passed from the university to the students, as Sutherland-Smith (2010:9) found, through her study of eighteen policies on plagiarism from different universities. She points out that many universities provide self-access resources for students to try to learn more about this area. An example of this can be found on the website “Writing Centre Online” (UCL Institute of Education, 2019), which includes a “Beginners Guide” page with step-by-step instructions on avoiding plagiarism, as well as various links to referencing and plagiarism resources. Despite this type of provision, Sutherland-Smith observes, the support provided is, on the whole, inadequate. It is interesting to note that this inadequacy can be seen at both an institutional level and from a student perspective, which will have implications as discussed in the following section . Sutherland-Smith expands further to explain that this inadequacy is partly because the advice provided is not specific enough for each student, and partly because distance students will often receive even less support, possibly, we could note, as they are wholly reliant on online materials . She concludes that these issues carry implications for the decisions around plagiarism management, as some students may receive more assistance than others, leading to questions of inequity. It could be considered that inequities are a particularly important issue in discussions of plagiarism management, given that controls on plagiarism could be seen, in principle, as intended to make the system fairer .

“Paraphrasing” means rewriting the same information in a different way. It helps you to better integrate the ideas into the particular piece you are writing.

Step-by-step paraphrasing

Use synonyms if appropriate, but do not change any specific terminology. In the example below, terms such as “plagiarism management”, “universities”, “students” and “distance” were not changed. The best place to find suitable synonyms will be elsewhere in the same article.
Add a detail about where the information came from, if necessary. In the example below, the information “through her study of eighteen policies on plagiarism from different universities” was added, to give some context to the claims.
Keep the author’s name and page number (you may have been told that you do not need the page number for a paraphrase, but if the idea came from one specific page, it is still useful to include it. That way, you can check the information again if you need to).

Text Comparison

Example original text.

Example paraphrased text

Sentence Analysis

Original : Universities also place the burden of understanding plagiarism and attribution conventions on students.

Paraphrase : The responsibility for learning how to reference correctly and avoid plagiarism tends to be passed from the university to the students, as Sutherland-Smith (2010:9) found.

Comment : Here, the following changes have been made:

Order of ideas or words (look for where “university” appears)
Word form (active “place the burden on” changed to passive “to be passed to”)
Synonyms (“understanding” changed to “learning how to”, “plagiarism and attribution conventions” changed to “reference correctly and avoid plagiarism”). Note some key terms have not been changed.

Original : There are myriad information-laden web-based self-help tutorials and workshops on related sites for the universities in this study.

Paraphrase : She also points out that [...] many universities provide online self-access resources for students to try to learn more about this area.

Order of ideas or words (look for where “university” appears).
Word form (descriptive “There are” changed to active “many universities provide”).
Synonyms (“information-laden web-based self-help tutorials and workshops on related sites” changed to “online self-access resources”, “myriad” changed to “many”). Note some key terms have not been changed.
Some information has been added, to help explain the meaning (“for students to try to learn more about this area”).

Original : Many are excellent resources and can be helpful.

Paraphrase : N/A

Comment : This sentence was not included in the new paraphrase, as the writer felt it was not important for their discussion.

Original : Nevertheless, the lack of additional, detailed individual assistance about the techniques of engaging in academic writing conventions, particularly for students studying in off-campus or distance modes, raises issues of equity for plagiarism management policymakers.

Paraphrase : ...The support provided is, on the whole, inadequate. Sutherland-Smith expands further to explain that this inadequacy is partly because the advice provided is not specific enough for each student, and partly because distance students will often receive even less support. She concludes that these issues carry implications for the decisions around plagiarism management, as some students may receive more assistance than others, leading to questions of inequity.

Comment : Here, the following changes have been made: • The information has been divided into sub-points, to try to express the point more clearly. Some explanatory words and linking words have been added, to help explain the meaning and to show that it is the original author who has made these claims (“Sutherland-Smith expands further to explain that...”) • Synonyms (“issues of equity” changed to “questions of inequity”, “raises issues” changed to “carry implications”). Note some key terms have not been changed.

As Hyland (1999) describes, referencing is central to academic writing: “Reference to previous work is virtually mandatory in academic articles [...] as a strategy for supporting current claims" (Hyland, 1999, p. 362).

The simplest way to think of referencing is to imagine that your reader might want to find out more about a piece of information or check the facts for themselves. Your reference shows them where to look .

It is important to provide correct references for any information which you give in your essay. Information could include ideas, facts, phrases, or anything else.

This means that you need to include references for all information , even if it is from something which you do not consider “academic”, such as an unregulated website. (Technically, it is probably best to avoid these sources of information anyway).

You need to provide a reference, whether or not you are using the exact words. Even if you change the words, someone might want to find out more about the information you are referring to.

If you use the same words as the original, you need to use quotation marks around this section, followed by the reference. If you do not use the same words, you do not need the quotation marks, you only need the reference itself. Make sure you include a list of references at the end of your essay. See the referencing guidelines for how to do all of this.

Referencing makes your point more convincing . Your reference shows that this information has been published somewhere, and you did not just make it up. If it is an opinion, your reference shows that other people writing in this area also share your opinion, which makes the opinion more interesting for your academic reader.

Sometimes you might want to think of your opinion as unique. It might be a coincidence that someone else thought of the same idea as you. Even if it is a coincidence, and you thought of the opinion by yourself, putting a reference to someone who also thought this way makes your opinion seem more valid to the academic community, as it is not simply one person's idea. Sometimes, it might be the case that you are the first person to have thought of an idea. If that is the case, you need to show how your idea is different from another person's idea. In all of these situations, you still need references!

It is a good idea to have a reference for every claim you make, if possible. Do not worry about using referencing too often. As a general rule, it is better to use the references too often than not enough. This does not refer to the number of different authors/texts, but the frequency of citing those authors. It should be high-frequency overall. You may have been given some advice not to use too many references. This advice means you don't need to have a long list of authors that you didn't read properly. Instead, it is better to use fewer texts, but read them in more detail. You may follow the examples on this site, or you may use a slightly different format. The most important aspect is to be consistent and use the same format for all your references.

In this situation, you need to use “cited in”. It is often useful to describe the secondary quotation a little more and show how it fits in with the first author. Here is an example. The writer had read Gray et al (2011) but wanted to mention another reference they used.

Example – Secondary citation : To further support their argument , Gray et al (2011:866) summarise a number of other studies which reported positive evaluations of coaching by coachees, including statistics such as "participants estimated return on investment of 5.7 times the initial cost" ( McGovern et al, 2001, cited in Gray et al, 2011:866). Studies such as these appear to indicate that coaching can be worthwhile for the individual and the organisation. Source: Anonymous UCL Institute of Education student (2013).

In this example, only Gray et al (2011) will appear in the reference list at the end of the assignment, as this is the only one that the student has read as a primary source.

You can often say that something is similar to an author's point, or connected to an author's point. You can even say that something contradicts an author's point. Using a reference doesn't only mean showing exactly where the information came from. It can also mean showing how information is connected to something that is published. It could also mean showing how an author's statement may be applied in a different context. Here is an example of something similar to this.

Example – Using a reference to show connections: As some of Bion's (1961) work has shown , groups can be particularly resistant to learning, preferring (if we can speak of a group as having a "preference") to preserve itself. As learning often means movement and change, it can be resisted by a group. Whether or not an 'organisation' can be considered equivalent to a 'group' in this context is outside the scope of this discussion, but insights such as those from Bion's work have been applied very usefully to analyses of the way that organisations may function in particularly conservative ways (see, for example, Armstrong, 2005). It can be useful to remember this when working with various staff members within an organisation. Source: Anonymous UCL Institute of Education student (2013)

For more information, please refer to the UCL guidelines on academic integrity, which include definitions of plagiarism.

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Turnitin Similarity Checker (self-access UCL Moodle course - login required).

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How Many References in a Research Paper?

Junior researchers frequently wonder how many references should be included in their research papers. The common response? “As many as you need.” What exactly does that mean? While we admit there are very few hard-set rules regarding this issue, in this article, we will try to provide more concrete guidelines that will help you assess whether you have enough references in your paper.

Before we do so, let us briefly explain why references matter and whether the number of references you include can project certain perceptions about the quality of your work. There is such a thing as having too many or too few.

Why are research paper references and citations necessary?

References show that you have carefully reviewed the relevant literature and are now contributing something novel to the academic community. You establish authority and credibility when you can critically assess other literature and distinguish your findings from previous works (if any exist). We emphasize “critically assess” in the last sentence because references are only as good as you apply them to your research. Therefore, the famous adage “quality over quantity” is the key to deciding how many references are sufficient.

Likewise, citing your references within the research paper itself (in the form of academic citations ) is crucial in any academic work that makes assertations based on external studies. Failing to cite your sources can result in plagiarism, which even if accidental can still have some devastating consequences for academic researchers hoping to publish their work or finish graduate school.

Number of Sources Used Can Impact Perceptions of Quality

We would be remiss if we didn’t tell you that being at either extreme (having too few or too many references) can reflect poorly on your intellectual aptitude and your study’s validity. Here’s why:

If you don’t have enough references, particularly on a topic familiar to a wide audience, readers may think that you haven’t done enough research into existing literature. Surely someone else has thought about related topics or used similar techniques. If you’re sloppy in conducting your diligence, readers will wonder whether your paper is worth reading. What’s novel and valuable about your paper? Were you just as sloppy with conducting your study? The answers to these questions need to be evident.
Additionally, readers might be concerned that you may have plagiarized by failing to properly cite information. Unless you’re John Nash, who cited only two texts in his seminal 26-page PhD thesis (one of which was to his prior work), ensure that you’ve properly researched the relevant papers and included appropriate citations! Especially, make sure that you have found, read, and included all the latest publications on your topic before finalizing and submitting your own paper—if the drafting process took some time, new literature might have come out in the meantime, and you don’t want to give the editor the impression that you are not on top of the newest developments.
If you have too many references, readers may wonder if you did any original research at all. Unless you’re writing a literature review, your paper’s primary focus should be on your investigation and findings. Don’t bury your hard work under strings of citations and discussion regarding other works. Show your readers what you’ve discovered and how the new information you present fits into or departs from the academic community’s current understanding of your topic.

Additionally, let us highlight the difference between the number of references versus citations. References are the source materials; therefore, each reference should be listed only once in your references section. Citations are meant to identify the source of the information you use in your paper. You can cite a reference multiple times. Therefore, the number of citations you have is typically larger than the number of references an average paper includes. The opposite situation should never happen!

Key Factors Influencing the Number of References You Use

The following are some of the many factors that may influence the number of references you use:

The number of references required for a paper will depend largely on your work’s purpose . For example, literature and systematic reviews are surveys of existing studies. Therefore, their reference lists will be more exhaustive than those of research papers whose primary focus is the current authors’ findings. Indeed, if you examine many journals’ author guidelines , you’ll note that journals have a higher maximum reference limit for review articles than original research papers.
The length of your reference list will also depend on your research paper’s subject matter . For example, if you are writing about a field that is less studied (such as a subfield of neuroparasitology) you may discover that there aren’t many papers to cite. Similarly, newer fields will have fewer published papers that can be referenced. If you find yourself in this situation, review the references used by relevant current literature and see if you can expand your research, and thus your reference list, with valuable content from there.
Another factor will be your institution or journal’s requirements . If you are preparing a dissertation or thesis, double-check your department’s requirements. While rare, they may have specific limits. More commonly, journals restrict the number of references due to printing constraints.
It may happen that you don’t have access to certain literature that could have served as a reference. In such a situation, you may wish to look for an institution that may be able to provide you access to that literature for the purposes of reviewing the content or contact one of the authors directly and ask for a copy.
Given that more papers are being published than ever before in most fields, it is likely that reference lists will grow longer simply because there are more data and discussions of existing data available to cite . Keep track of changes to the size of reference lists in publications related to your field.
Finally, a paper’s length bears some correlation to the number of references.

So how many references should be included?

Below, we provide tips on how to decide if you have enough resources. We also provide some general reminders on how to effectively use references. After all, references are meant to enhance your paper while still maintaining your research as the focal point.

Use academic journals as a guide

One way to gauge how many references you should have is to survey academic journals for your article type in your field. Review their author guidelines for limits on the number of references for your article type, and make sure your reference list complies with those journal restrictions.
Read recent articles relevant to your topic; check how many references other authors have included in their papers for the same article type as yours, and how frequently those works were cited per page.
Keep in mind that the above methods will give you an estimate of how many references you should include overall but will not tell you how many citations you’ll need per page. The latter is impossible to state simply because certain sections may have no citations at all (the results section , for example).

Statistics regarding the number of references and citations

To give you a general idea, the following are some estimates from a couple of studies that examined the citation characteristics of articles published in various disciplines.

According to Milojević’s study encompassing research in the fields of astronomy, mathematics, robotics, ecology, and economics, the highest and average number of references per article page were as follows:

Ecology: highest, ~58; average reference per page, 6;
Math and robotics: highest, ~28; average reference per page, <1; and
Economics: highest, ~ 32; average reference per page, >1 but <2.

The above findings were based on data compiled from the first 20 years of the author’s research. Since then some fields have increased the number of references. Thus, make sure to examine your target journal’s most recent and relevant publications for a better idea of how many references to include based on the specific type of article you plan to write.

In another study by Falagas et al. (2013), medical journals averaged 29 references for articles that were 7.88 pages long (as printed in journals).

Finally, although the sample size was small (63 journals), Gali Halevi observed the following citation trends of a broader range of disciplines.

The average number of references per article was the highest for the social sciences, physics, and astronomy, and arts & humanities (roughly 54 references per article).
On the other hand, health professions and earth and planetary sciences had the fewest references per article at an average of 8 and 17 references, respectively.
Math and engineering averaged at roughly 29 references per article.
Biochemistry, genetics and molecular and other biological sciences averaged at 51.
Hard and natural sciences more frequently cited recent literature while social sciences and math were likely to include older sources.

Note that the Halevi study is limited in size, fails to factor in article type and does little to account for variances across different fields and journals. For example, it is possible that more review articles could have been reviewed for certain fields than others. With that said, we provide the above information to provide a rough estimate.

At the end of the day, please keep in mind the requirements of your institution or target journal and the general trends for your specific article type (by examining the most recent relevant publications).

For additional information regarding journal restrictions on the number of references, read this article on ways to grow your publication list .

Some Dos and Don’ts for Reference Citation

Don’t repeat references within a reference list.
Don’t repeatedly cite yourself. Make sure to balance your discussion with external literature citations.
Be careful about citing old references. The rule of thumb is to go back at most five to six years. Exceptions to this rule should be reserved for “seminal” works relevant to explaining what prompted your research. Roughly 85% of all cited works should be less than five years old.
Be careful not to cite several references in one place without discussing the relevance of each work to your research. In other words, don’t say, “We referred to previous studies in this field (1-7)” unless you later explain how each of reference #s 1-7 apply to your discussion.
Confirm the quality of the work you cite. Are there any ethical issues regarding the paper that would disqualify it as a good source? Do your references come from reputable sources such as respected journals rather than random blogs and website links? Remember that your analysis is only as good as the verifiable information you use to conduct your research.
One of the main purposes of citing existing literature is to show the “knowledge gap” regarding your topic. Therefore, make sure the works you reference naturally lead readers to wonder about the research question you address in your paper. To explain further, think about your favorite fictional story. A successfully written story only reveals the background information needed for the reader to follow along in the story. You’ll rarely see an author waste time writing about how the main character stubbed his toe one day while going to work unless that event relates to an important aspect of the story. Similarly, the references you cite should support the story building you create in your research paper.
Don’t completely ignore the paper that could disprove your hypothesis. You want to show objectivity and that you took a balanced and unbiased approach to conducting your research. Mention the potentially conflicting evidence and explain why you believe it is flawed or inapplicable to your research.
In qualitative research papers, you may have fewer references.
Anything you cite in your paper should be listed in the references section (or reference list). Anything listed as a reference should have been quoted or paraphrased in the text. If either rule is violated, something is wrong.
Finally, remember that a paper will typically have more citations in the Introduction section and Discussion section than in other parts.

Wordvice Academic Resources

If you need help with paraphrasing text from the sources you cite to avoid plagiarism, with different citation styles , or with finding the perfect journal to submit your paper to, then have a look at our collection of articles on the Wordvice academic resources website . We also recommend our professional English editing and proofreading services , including paper editing and academic editing services to ensure that your writing is free of errors before submitting your manuscript to a journal.

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COMMENTS

Is there such thing as too many references for one paper?
Many do (mostly print journals), and would force authors to cut down the number of references. As far as I know, there is no limit on the number of references, only on the number of pages, which is respected. There is probably some discipline influence at work.
How often should you reference? | Oxbridge Essays
Using too many references does not leave much room for your personal standpoint to shine through. As a general rule, you should aim to use one to three, to support each key point you make. This of course depends on subject matter and the point you are discussing, but acts as a good general guide.
Appropriate level of citation - APA Style
The number of sources you cite in your paper depends on the purpose of your work. For most papers, cite one or two of the most representative sources for each key point. Literature review papers, however, typically include a more exhaustive list of references.
How to Reference in an Essay (9 Strategies of Top Students)
A good rule of thumb is 1 source listed in the reference list per 150 words. Here’s how that breaks down by essay size: 1500 word essay: 10 sources (or more) listed in the reference list. 2000 word essay: 13 sources (or more) listed in the reference list.
How Many References Should I have in an Essay? | Gradmode
Can you use too many references in an essay? Yes, having an excessive amount of references in-text dilutes the quality of your paper. Doing this is going to make your paper seem like a very long literature review.
How many references should I have? - Imperial College London
Students sometimes worry that there is an optimum number of references that they need to cite. There’s no right or wrong answer answer as to how many references you need – it depends on how many you’ve cited in your writing! The most important thing is that you don’t plagiarise.
How to Cite Sources | Citation Generator & Quick Guide - Scribbr
The most commonly used citation styles are APA and MLA. The free Scribbr Citation Generator is the quickest way to cite sources in these styles. Simply enter the URL, DOI, or title, and we’ll generate an accurate, correctly formatted citation.
Referencing and avoiding plagiarism | IOE - Faculty of ... - UCL
Step 1: Direct Quotation. Find the idea that you want to include. Write this idea in direct quotes. Add the author’s name and page number. Put the full reference at the end of your document, to make sure you remember to include it. You have avoided plagiarism. Stop here, or continue to Step 2, to develop your writing further.
How Many References in a Research Paper? - Wordvice
One way to gauge how many references you should have is to survey academic journals for your article type in your field. Review their author guidelines for limits on the number of references for your article type, and make sure your reference list complies with those journal restrictions.
What is the standard number of references to be used in a ...
The number of references you will use depends on how much literature exists on the topic. If you are working on a very new and original idea, you might not have too many sources to cite, while, if you’re developing a tried and tested topic, you might end up having a lot of references.