APA vs MLA vs Chicago vs IEEE: Key Differences
Compare four common citation styles and choose the one required for your subject or assignment.
Citation styles arrange the same source information in different orders and punctuation. APA emphasizes author and year, MLA author and page, Chicago either notes or author-date, and IEEE numbered references.
The correct choice comes from the assignment, department, or publication—not personal preference. If no style is specified, use one common in the discipline and apply it consistently throughout the document.
What each style emphasizes
APA is common in social sciences and places the year early so readers can judge recency. MLA is common in the humanities and uses compact author-page citations in the text.
Chicago is widely used in history and publishing, often with footnotes and a bibliography, while also offering author-date. IEEE uses numbers such as [1] to keep technical prose concise.
- APA: author and year
- MLA: author and page
- Chicago: notes-bibliography or author-date
- IEEE: numbers in citation order
Why a generated citation still needs review
A generator arranges the information you enter, but it cannot always identify every source type or exception. Edited books, translations, many-author papers, and online-first articles need extra checks.
Review capitalization, italics, DOI format, and whether an access date is required. A perfectly formatted citation is still wrong if the source details were entered incorrectly.
Check consistency across the document
Match every in-text author, date, page, or number to an entry in the reference list. Remove unread background items that were never cited, and add cited items that are missing.
Do not mix styles in one document. When a department supplies examples, follow the example for the closest source type.
Style-selection checklist
- Check assignment and department rules
- Collect required fields for each source type
- Match in-text citations with the list
- Review capitalization, italics, and DOI
Frequently asked questions
Do style editions matter?
Yes. APA 7 and earlier editions, for example, differ in author display and other details. Confirm the edition required by the course or journal.
Should a webpage appear in references?
If it supports your assignment, cite it. Collect the author, date, page title, site name, and URL when available.