Citation Guides
MLA vs APA vs Harvard: Which Citation Style Should You Use?
They all cite sources — but not the same way. Here's how to tell which style your assignment actually needs.
SwiftTutorsPro Editorial Team
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7 min read
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Almost every instructor assumes you already know which citation style to use — but the truth is, it depends entirely on your discipline, and the three most common styles handle the same information in noticeably different ways.
1. Who uses which style?
- MLA (Modern Language Association): Literature, languages, cultural studies, and humanities.
- APA (American Psychological Association): Psychology, education, nursing, social sciences, and business.
- Harvard: Widely used across UK, Australian, and many international universities, especially for business, economics, and general essays.
When in doubt, check your assignment brief or module handbook first — many universities have their own house variation of Harvard style with small formatting quirks, so "Harvard" isn't always applied identically everywhere.
2. In-text citation format, side by side
Same source, three different in-text formats:
- MLA: (Smith 42) — author's last name and page number, no comma, no year.
- APA: (Smith, 2020, p. 42) — author, year, and page all separated by commas.
- Harvard: (Smith, 2020, p.42) — very close to APA, but formatting of the page abbreviation and punctuation can vary slightly by institution.
The biggest structural difference: MLA doesn't use the publication year in-text at all, because MLA's Works Cited entries are organized to make the year secondary — literature scholars are usually more interested in the specific edition or page than the date.
3. Reference list naming & structure
| Style |
List is called |
Author format |
| MLA |
Works Cited |
Last name, First name |
| APA |
References |
Last name, First Initial. |
| Harvard |
Reference List / Bibliography |
Last name, First Initial. |
MLA's Works Cited format also uses a distinctive "container" system — describing where a source lives (a journal, a website, an anthology) — which trips up a lot of students moving from APA to MLA for the first time.
4. A fast way to identify what you need
- Check the assignment brief or rubric first — the required style is almost always stated explicitly.
- If it's not stated, check your department's general convention. Humanities → MLA. Sciences/social sciences → APA. General UK/international coursework → Harvard.
- Still unsure? Ask your instructor directly — it takes one email and avoids a full re-formatting pass the night before your deadline.
Consistency matters more than perfection
Whichever style you use, the biggest grading red flag isn't a single formatting slip — it's inconsistency. A paper that mixes MLA in-text citations with an APA-style reference list signals rushed work, even if every individual citation is technically well-formed. Pick one style, apply it throughout, and double-check the reference list last.