One of the most technical yet most confusing decisions when writing your paper is which citation style to use. APA? IEEE? Vancouver? The wrong style makes your paper look messy and often costs you a revision round. The good news: the difference between them rests on a much simpler logic than it first appears. This guide explains the three common styles and when to use each.
Two core families: author-date and numbered
There are dozens of citation styles, but they all fall into one of two big families:
- Author-date — you write the author's name and year in the text: (Yılmaz, 2024). The reference list is ordered alphabetically. APA is the most common member of this family.
- Numbered — you use a number in the text: [1] or (1). The reference list is ordered by citation order. Vancouver and IEEE belong here.
Once you grasp this distinction, everything else is a formatting detail.
APA (7th edition)
APA is the standard of the author-date system. You cite in text as (Author, year); for direct quotes you add a page number: (Yılmaz, 2024, p. 12). The reference list (References) is ordered alphabetically. It's used mainly in social sciences, education and psychology.
Vancouver
Vancouver is the standard of medicine and health sciences (the NLM format). In-text citations are numbered by citation order: (1), (2)… or as superscript. The reference list is ordered by the sequence in which sources first appear in the text — not alphabetically. It's preferred in citation-heavy clinical papers because it keeps the running text clean.
IEEE
IEEE is the standard of engineering and computer science. Like Vancouver it's numbered, but citations appear in the text in square brackets: [1], [2]. The reference list is again ordered by citation order. Most electrical, computer and general engineering journals ask for this style.
Comparison at a glance
| Style | In-text | Reference order | Common field |
|---|---|---|---|
| APA (7) | (Author, year) | Alphabetical | Social sciences, education, psychology |
| Vancouver | (1) or superscript | Citation order | Medicine, health sciences |
| IEEE | [1] | Citation order | Engineering, computer science |
Which one should you use?
The most critical point: the style is set by the journal you submit to, not by you. Whatever your field's "general" style is, the binding source is the journal's author guidelines (instructions for authors). So the right order is: choose the right journal first, then format your references to the style it requires.
The good news: many journals now accept format-free submission — meaning you don't have to force your references into that journal's exact format on first submission; you tidy them up after acceptance. Even so, a consistent, complete reference list always makes a good impression.
In practice: don't fight the formatting by hand
Formatting your sources one by one is both tedious and error-prone. A reference manager like Zotero or Mendeley lets you collect your sources once and then switch between APA, IEEE, Vancouver and thousands of journal styles in one click. This is the biggest time-saver when adapting a paper for another journal.
Choosing the right journal also settles which citation style you'll use up front. Peerfect's free journal recommendation engine puts journals matching your paper's scope in front of you; once you've picked your target journal, you learn its reference style from its guidelines in one go.
In short: citation styles look complex, but the logic is simple — either author-date (APA) or numbered (Vancouver, IEEE). Know your field's tendency, but always give the final word to the journal's author guidelines; and let a reference manager do the formatting.
Sources: Citation Styles Guide — Scribbr, Vancouver vs APA Referencing — GenText, Citation Styles: APA, MLA, Chicago, IEEE — University of Pittsburgh. Exact formatting rules vary by the style's current edition and the journal's author guidelines.