To cite sources in an essay, add a short in-text citation wherever you use someone else's words or ideas, then list the full details of each source at the end. Your citation style, such as APA, MLA, Harvard or Chicago, decides the exact format.
Citing shows where your evidence comes from, lets readers check it and protects you from plagiarism. This guide covers what to cite, how to quote and paraphrase, examples in four styles and common mistakes.
How Citing Works in Three Steps
- Use the source: quote, paraphrase or summarise it in your essay.
- Cite it in the text: add the author and year, a page or a note number, as your style requires.
- List it at the end: give full details in a reference list, works cited page or bibliography.
Every in-text citation must match an entry in your list, and every entry must be cited at least once.
What Needs a Citation?
| Cite it | No citation needed |
|---|---|
| Direct quotations | Your own ideas, arguments and analysis |
| Paraphrased or summarised ideas | Common knowledge, such as "Paris is the capital of France" |
| Statistics, data and research findings | Your own original data, described as such |
| Theories, models and frameworks | Widely known dates and facts found in many general sources |
| Images, tables and figures from others | Tables and figures you created from your own data |
If you are unsure whether something is common knowledge, cite it. Over-citing costs little; failing to cite can count as plagiarism.
Quoting, Paraphrasing and Summarising
There are three ways to use a source. Each needs a citation.
| Method | What it is | When to use it |
|---|---|---|
| Quoting | The author's exact words in quotation marks | When the wording itself matters |
| Paraphrasing | A specific idea in your own words and structure | Most of the time |
| Summarising | The main point of a longer passage or whole work, briefly | For background or an overview |
Original: "Students who spaced their revision over several weeks retained far more material than those who crammed."
Quotation (APA): Mensah (2021) found that students "who spaced their revision over several weeks retained far more material" (p. 212).
Paraphrase (APA): Spreading revision across several weeks leads to much better retention than cramming (Mensah, 2021).
A paraphrase must change both the words and the sentence structure. Swapping a few words for synonyms is still too close to the original.
A useful method: read the passage, close the source, write the idea from memory in your own words, then check it against the original for accuracy and accidental copying. Add the citation straight away, so you never lose track of where an idea came from.
Which Citation Style Should You Use?
Your tutor or department sets the style. If the brief does not say, check the course handbook or ask.
| Style | Common subjects | In-text format | List at the end |
|---|---|---|---|
| APA 7 | Psychology, education, nursing, social sciences | (Smith, 2020) | References |
| MLA 9 | English, languages, cultural studies | (Smith 45) | Works Cited |
| Harvard | Many UK and Australian courses | (Smith, 2020) | Reference list |
| Chicago notes | History, theology, the arts | Footnote number | Bibliography |
In-Text Citations and References: Examples
The same book, cited in four styles. The details are illustrative: Jane Smith, Learning to Learn, Oxford University Press, 2020, quoted from page 45.
APA 7
In-text: (Smith, 2020, p. 45)
Reference: Smith, J. (2020). Learning to learn. Oxford
University Press.
MLA 9
In-text: (Smith 45)
Works Cited: Smith, Jane. Learning to Learn. Oxford UP,
2020.
Harvard (Cite Them Right)
In-text: (Smith, 2020, p. 45)
Reference: Smith, J. (2020) Learning to learn. Oxford:
Oxford University Press.
Chicago (Notes and Bibliography)
Note: 1. Jane Smith, Learning to Learn (Oxford: Oxford
University Press, 2020), 45.
Bibliography: Smith, Jane. Learning to Learn. Oxford:
Oxford University Press, 2020.
Harvard has many local versions, so follow your university's own guide if it differs.
Citing Different Types of Source
Each source type needs slightly different details. These APA 7 examples use illustrative authors and titles; other styles need the same information in a different order.
Journal article: Chen, L. (2021). Memory and form in the postwar novel. Modern Fiction Studies, 67(2), 15–34. https://doi.org/10.xxxx/xxxxx
Web page with an organisation as author: World Health Organization. (2023, March 2). Adolescent mental health. https://www.who.int/...
Chapter in an edited book: Okafor, N. (2019). Motivation in adult learners. In R. Patel (Ed.), Handbook of adult education (pp. 85–102). Routledge.
No date: in the text, (Mensah, n.d.); in the list, (n.d.) in place of the year.
Collect these details as you research. Hunting for a missing page range or DOI the night before the deadline wastes time.
Where and How Often to Cite
Place the citation as close as possible to the borrowed material. In APA and Harvard, it usually goes at the end of the sentence, before the full stop, or after the author's name in a narrative citation.
- When one sentence draws on two sources, cite each where its idea appears, or together at the end separated by semicolons.
- When a whole paragraph draws on one source, cite it in the first sentence and again wherever it might be unclear which ideas are yours.
- When you add your own analysis, make the shift clear with phrases such as "This suggests" or "However, this overlooks".
Readers should always be able to tell where the source ends and your thinking begins. That clarity is what markers reward.
Using Signal Phrases
A signal phrase introduces a source by name and helps your writing flow. It also lets you show your attitude to the source.
| Purpose | Signal verbs |
|---|---|
| Neutral reporting | states, notes, describes, reports |
| Arguing | argues, claims, contends, maintains |
| Agreeing or building on | confirms, supports, extends |
| Disagreeing | challenges, disputes, questions |
Okafor (2022) argues that peer feedback improves writing, but Lee (2023) questions whether the effect lasts beyond a single module.
Building the Reference List
- Start the list on a new page with the heading your style uses: References, Works Cited or Bibliography.
- List entries alphabetically by the first author's surname (in APA, MLA, Harvard and Chicago notes).
- Use a hanging indent and the line spacing your style requires, usually double spacing in APA and MLA.
- Include only sources you cited, unless your tutor asks for a full bibliography.
- Check every in-text citation against the list before you submit.
- Make sure author names, years and titles are spelled the same way in the text and in the list.
- Add DOIs or URLs for online sources where your style requires them.
A reference manager such as Zotero, Mendeley or EndNote can format citations for you. Always check its output, as imported details are often incomplete.
Common Citation Mistakes
| Mistake | Fix |
|---|---|
| Quotation with no page number | Add the page, or a paragraph number for web sources |
| Paraphrase that is too close to the original | Change the words and the structure, and still cite |
| Citations that do not match the list | Check both directions before submitting |
| Mixing two styles | Use one style consistently throughout the essay |
| Citing a source you did not read | Use a secondary citation, such as "as cited in" |
| Too many long quotations | Paraphrase most material and quote sparingly |
How EssayDonkey Helps You Cite Sources in an Essay
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Frequently Asked Questions
Add an in-text citation where you use the source, such as (Smith, 2020) in APA, and list the full details in a reference list at the end.
Yes. Paraphrased and summarised ideas need a citation just like quotations, because the ideas belong to someone else.
Facts widely known and found in many general sources, such as major historical dates. If you are unsure, cite.
It depends on length and level. A 1,500-word undergraduate essay often uses six to ten credible sources.
Yes, if it is credible. Give the author or organisation, date, page title and URL in your style's format.
A reference list includes only sources you cited. A bibliography can also include sources you read but did not cite. Chicago uses "bibliography" for its list of cited sources.
In APA, MLA and Harvard, the citation sits inside the sentence, before the full stop. In block quotations, the citation follows the final full stop.
Use a secondary citation, such as (Brown, 1998, as cited in Smith, 2020) in APA, and list only the source you actually read.
Only if your tutor allows it. It is usually better to find and cite the original source the slides draw on.