Integrating and Citing Sources


Integrating sources that contain useful information into your scientific written work makes for a credible document, but it is very important to cite these sources correctly. Many people find this challenging or confusing and fall into the trap of committing intentional or unintentional plagiarism as a result. While incorporating sources and citing them correctly in your work will increase your credibility, plagiarizing sources will reduce your credibility and get you into trouble with your instructors.

Proper referencing includes two parts: in-text citations and a complete reference list of sources from which these arose. In-text citations show the reader that specific information you have used to strengthen your paper comes from the work of others. The list of sources at the end of your paper gives the exact references you used, which allows anyone to easily find and refer back to them.

What (and when) to Cite

Often, it can be difficult to know what you need and do not need to cite in your work. Table 1 (below) provides some general guidelines. However, if you are ever unsure if something should be cited or not, you should probably cite it just to be safe. Alternatively, you could talk to your instructor, TA, or classmates for advice.

Table 1: Guidelines on what to cite and what not to cite

What you NEED to cite What you DO NOT NEED to cite
  • Ideas, concepts, opinions, etc. of others
    • Direct quotes, summaries, paraphrases
  • Common knowledge
    • General (Shakespeare wrote Hamlet)
    • Field-specific (a double bond is stronger than a single bond)
  • Facts used as evidence
    • Findings, conclusions, theories
  • Facts which are easily verifiable and for which no controversy exists (Penicillin was discovered in 1928)
  • Distinctive or authoritative ideas

Citation Formatting

Whether you are including a quote or a paraphrased sentence (see below for tips on paraphrasing) in your writing from someone else’s work, it must be cited. In science writing there are two general styles for citing references in text: expanded referencing or abbreviated referencing (see below). We generally cite information from journal articles more often than other sources in science writing because they typically contain the most up-to-date information, but the same formatting is used for books as well.

1) Expanded referencing (author-year): Includes the author’s last name and the year of publication for in-text citing, and an alphabetical list of references at the end of the article.


• if there are only one or two author names, cite both names in-text
• if there are more than two author names, only write the first name followed by “et al.”

2) Abbreviated referencing (author-number): Includes a number in parentheses or superscript for in-text citing and a numerical list of references at the bottom of the article (i.e. the order in which they are found in the text).

Some Examples

These examples are designed to highlight how each style of citing can be used. Although there is sometimes flexibility when citing, remember to check with your instructor which style you should use. If he/she is happy for you to use either one, make sure you are always consistent in your formatting style (i.e. don’t mix the two styles in one piece of writing).

Expanded Referencing:

A) Blue, left-handed widgets are actually wodgets (Smith, 1993).
B) Bloggs et al. (1995) confirmed that …
C) Smith and Jones (1995) wrote that…

Abbreviated Referencing:

A) Blue, left-handed widgets are actually wodgets3.
B) Bloggs et al.2 confirmed…
C) Smith and Jones [2] wrote that…


Table 2: Advantages of expanded and abbreviated referencing

Style of citing Advantage
Expanded Referencing • author/researcher is found in text (easily recognizable for a researcher in the field)

• show date of research (current)
• easy to find a particular paper

Abbreviated Referencing • saves time

• saves space (no extra words- names, dates)
• easier to read the article

When deciding which style of citing to use, keep in mind the advantages of both, but make sure you follow any directions you were given. Once you choose a style, you must stick to it throughout your whole article. It is very important to be consistent with your formatting; it makes it easier for the reader to follow!

Using Quotations and Paraphrasing

In science writing, it is rare to use direct quotes; they can be long and sometimes very confusing for a reader. It is generally better to paraphrase or summarize than to use quotes. This shows you have an understanding of the material, whereas using quotations of the work of others doesn’t often show that you understand - or are able to - synthesize what you’ve read and tailor it appropriately to what you are writing about.

In science, only use quotations if a piece of information is well-phrased or unique and cannot be simply rephrased to have the same effect. For example, don’t write: Cliff et al. (1989) reported that “A total of 591 great white sharks Carcharodon carcharias were caught between 1974 and 1988 in the gill nets which are maintained along the Natal coast to protect bathers from shark attack.” Instead, write something like: Nearly 600 great white sharks were caught in gill nets along the Natal coast between 1974 and 1988 (Cliff et al. 1989).

When -- and How -- to Use Quotations

Quotes appear in almost every good news story because they add an extra level of interest for the readers, so when you are writing a journalistic science article, you should try to incorporate some. However, as always, writing concisely and telling a story as simply as possible is of vital importance. For this reason, a good story only ever contains good quotes; simply filling space with quotes will put your readers off, rather than encouraging them to absorb the tale you are telling.

You should always try to make your story accessible to the audience to which it is targeted. For example, suppose you had spent three years in a genetics lab and discovered how a gene functioned to protect fruit from pests. When it came to communicating your research, you would write two very different articles to a specialist science magazine and a newspaper that would be read by more diverse audiences.

However, in both cases, you would likely add quotes to help make the article more engaging. Although you might include more jargon in the specialist version, there is a fairly standard set of guidelines for choosing quotes that you would be able to apply to both articles.

In general, and in order of importance, the following elements will all be present in a good quote:

1) It will be attributed to a relevant source with something meaningful to say.

2) The information contained in it will add to, expand, and/or personalize the story.

3) It will be easy to understand, even if it contains comparisons/descriptions.

4) Although not always the case, impact tends to be higher if the word count is small.

In contrast, the following elements tend to be present in a bad quote:

1) The information contained in it is boring, redundant, repetitive, contains jargon, overly complex words, or is incoherent and hard to follow.

2) It is taken from a source that was not introduced earlier in the article, or from a non-relevant source with nothing of importance to add to the story.

3) It is not concise and/or is hard to interpret.

The Importance of Paraphrasing

As mentioned above, you should generally try to paraphrase a source when citing it in science writing, particularly when you are writing a lab report or journal article. While using quotes is more common in journalistic science writing, sometimes even then you should paraphrase in preference.

Sometimes, for example, you will have access to a quote from a relevant source but there will be a problem with it that prevents you using it word for word. For example, perhaps the quote contains too much jargon for your audience, or maybe it makes a good point but is too long-winded. In either of these instances, it would be a shame not to use the information in the quote if it could improve the quality of your writing, but using the quote itself would have the opposite effect. So what do you do?

The answer is that you should paraphrase the information.. In other words, you are going to attribute it to the source, but only include the information that is relevant to your audience. For example, imagine Prof. Stout provided the following quote:

“We had the feeling that crops would be considerably less valuable if they were solely wind-pollinated, but it had never been shown experimentally before. Now we know for sure just how valuable these bees are in terms of boosting yield, we hope it will give us the power to convince governments to step up their efforts of conserving them. The bees help us, so we need to repay the favour!”

Rather than using the (whole) quote, which contains admittedly interesting information in a long-winded way, you could paraphrase it like this:

Professor Stout explained that she hopes governments will help conserve bees now it has been shown how valuable their pollination service is.

Because the second part of the original quote is concise and interesting, you could also think about including it after your initial paraphrased sentence, like this:

Professor Stewart explained that she hopes governments will help conserve bees now it has been shown how valuable their pollination service is. She said: “The bees help us, so we need to repay the favour!”

Re-ordering Transcripts and Quotations

If/when you interview somebody as a source, you will probably produce a transcript of information ordered in a way that does not tell the most interesting story possible; in spoken conversations about complicated subjects people rarely explain themselves smoothly or without backtracking.

As a result, you will often have to re-order things when incorporating quotes into your article. This might mean paraphrasing parts of a quote and including other parts of it as a direct quote, or it might mean swapping the order of quotes so that the story follows a more logical development. Although this is a common, and necessary action, you must be careful not to take quotes out of context when doing this. Make sure that when you read the original transcript and compare it to the re-ordered quotes in your article, you are satisfied that you have not misrepresented your source in any way!

Choosing Descriptive Words to Introduce Citations.

Because you must interpret a source when you paraphrase or summarize it, you must be very careful not to misrepresent the author in any way, which is easier than you might think. For example, writing that Reilly (2010) found that more than one cup of morning coffee slows response rates in people, is not the same thing as writing that Reilly (2010) argued that more than one cup of morning coffee slows response rates in people.

Although it is sometimes important to use ‘strong’ descriptors such as argue, challenge, confess, attack etc. it is generally a good idea to use ‘neutral’ descriptors whenever possible, as these cannot be misinterpreted so easily.

For example, writing that Reilly (2010) wrote that more than one cup of morning coffee slows response rates in people cannot be misinterpreted, and therefore removes any concern that you might have about paraphrasing his/her work.

Video Resource

For a recap and for some extra information on citing and integrating sources, please watch Grammar Squirrel’s video on the UBC Science Writing YouTube channel.

We then suggest you complete the quick quiz (below) to see whether you have mastered some of the important skills relating to effective use of citing and integrating sources.

Integrating and Citing Sources

  • 1) Should the following piece of information, taken from a real source, be quoted directly or paraphrased and cited?
    ‘Telomeres are specialized structures found at the natural ends of eukaryotic linear chromosomes.’
  • 3) Should the following piece of information, taken from a real source, be quoted directly or paraphrased and cited?
    ‘I’m so excited – this new discovery blows the old belief clean out of the water.’
  • 5) Should the following piece of information, taken from a real source, be quoted directly or paraphrased and cited?
    ‘Changes to the conformation of coding and non-coding RNAs form the basis of elements of genetic regulation and provide an important source of complexity, which drives many of the fundamental processes of life.’