There are three main types of citation: author-date citations such as (Rivera, 2022), numeric citations such as [4], and note citations that use footnotes or endnotes. Every major citation style is built on one of them.
Knowing the type before you learn a specific style makes the rules far easier to follow. This guide explains each type, shows examples, lists the styles that use it and covers the hybrids and special cases you may meet.
The Three Types of Citation at a Glance
- Author-date (parenthetical): the author and year in brackets in the text, with an alphabetical reference list. APA, Harvard, Chicago author-date.
- Numeric: a number in the text pointing to a numbered reference list in order of citation. IEEE, Vancouver, AMA.
- Notes: a superscript number pointing to a footnote or endnote, usually with a bibliography. Chicago notes-bibliography, Turabian, OSCOLA, MHRA.
MLA is close to author-date but uses author and page, (Rivera 45), rather than the year.
Why the Style Matters More than the Type
Students often ask "what type of citation should I use?" The better first question is "which style does my course require?" The style decides the type for you: APA means author-date, IEEE means numeric, OSCOLA means footnotes.
Understanding the type still helps. It tells you how the reference list will be ordered, what goes in the text and how much work revising the paper will involve. It also makes a new style quicker to learn, because you already know its basic logic before you open the manual.
Type 1: Author-Date (Parenthetical) Citations
Author-date citations put the author's surname and the year of publication in the text, usually in brackets. Readers see immediately whose work you are using and how recent it is.
APA 7: Shared decision-making improves patient satisfaction (Rivera & Cole, 2022).
Harvard (common form): Shared decision-making improves patient satisfaction (Rivera and Cole, 2022).
Chicago author-date: Shared decision-making improves patient satisfaction (Rivera and Cole 2022).
Reference (APA 7): Rivera, L., & Cole, D. (2022). Shared decision-making in outpatient care. Journal of Patient Experience Studies, 7(1), 15–29. https://doi.org/10.0000/jpes.2022.071
- Reference list: alphabetical by surname.
- Narrative form: Rivera and Cole (2022) found that...
- Used in: psychology, nursing, education, business, social sciences, many sciences.
Type 2: Numeric Citations
Numeric citations replace names with numbers. Each source gets a number the first time it is cited, and that number is reused every time the source appears again.
IEEE: Shared decision-making improves patient satisfaction [3].
AMA: Shared decision-making improves patient satisfaction.3
Reference (AMA 11): 3. Rivera L, Cole D. Shared decision-making in outpatient care. J Patient Exp Stud. 2022;7(1):15-29. doi:10.0000/jpes.2022.071
- Reference list: in order of first citation.
- Markers: square brackets, round brackets or superscripts, depending on the style.
- Used in: engineering, computing, medicine, health sciences, some physical sciences.
Type 3: Footnote and Endnote Citations
Note citations place a superscript number in the text and give the source in a numbered note at the foot of the page or the end of the document. A full note appears the first time, and a short note after that.
Text: Shared decision-making improves patient satisfaction.3
Full note (Chicago 18th): 3. Lucia Rivera and David Cole, "Shared Decision-Making in Outpatient Care," Journal of Patient Experience Studies 7, no. 1 (2022): 18.
Short note: 4. Rivera and Cole, "Shared Decision-Making," 21.
- Bibliography: usually alphabetical, listing all sources.
- Used in: history, art history, theology, music, law and some humanities.
The citations on this page are illustrative and show layout rather than real articles.
Quick Reference Table
| Type | In the text | List order | Example styles | Typical fields |
|---|---|---|---|---|
| Author-date | (Rivera, 2022) | Alphabetical | APA, Harvard, Chicago author-date | Social sciences, nursing, business |
| Author-page | (Rivera 45) | Alphabetical | MLA | Literature, languages |
| Numeric | [3] or superscript | Order of first citation | IEEE, Vancouver, AMA | Engineering, medicine |
| Notes | Superscript and footnote | Bibliography alphabetical | Chicago notes, Turabian, OSCOLA, MHRA | History, law, humanities |
The free Bibloq citation generator produces entries in styles of all three types, which helps when you need to compare or convert.
Citation, Reference and Bibliography: The Terms
The words are often used loosely, which adds to the confusion. In most style guides they mean distinct things.
| Term | Meaning | Example |
|---|---|---|
| In-text citation | The short marker in your sentence | (Rivera, 2022), [3] or a superscript number |
| Reference | The full entry for one source | Author, date, title, source details |
| Reference list | All sources cited, at the end | References (APA), Reference list (Harvard) |
| Works Cited | MLA's name for the reference list | Sources cited in an MLA paper |
| Bibliography | A list that may include sources consulted but not cited | Chicago notes-bibliography papers |
What Every Type Requires You to Cite
Whatever the type, the obligation is the same. Cite direct quotations, paraphrases, summaries, statistics, images, data and any distinctive idea that is not your own or common knowledge in your field.
- Quotation: exact words in quotation marks, with a page or locator.
- Paraphrase: a specific passage in your own words, still cited, often with a page.
- Summary: the main idea of a whole source or section, cited.
The type of citation only changes how you mark the source, never whether you mark it. Leaving out a citation is a problem in every system, whichever style your course uses.
Hybrid and Special Cases
- Chicago: offers two separate systems, notes-bibliography and author-date. A paper uses one, not both.
- Content notes: APA and MLA papers may use occasional footnotes for explanations while citing sources in the text.
- Legal citation: OSCOLA and Bluebook use footnotes with rules for cases and legislation that other styles do not have.
- Chemistry and physics: some house styles allow either numeric or author-date variants.
- Narrative citations: every type lets you name authors in your sentence, with the date, number or note added as the style requires.
Why the Type Matters in Practice
| Task | Author-date | Numeric | Notes |
|---|---|---|---|
| Adding a source while drafting | Easy | May shift later numbers | Automatic if using the footnote tool |
| Moving paragraphs | No change | Recheck numbering | Short and full notes may need swapping |
| Reader sees author in text | Yes | No | In the note |
| Space taken in text | More | Least | Little in text, more on the page |
If you write in a numeric or note system, use your word processor's automatic tools or a reference manager. Typing numbers by hand is the main source of errors.
How to Know Which Type Your Assignment Needs
- Check the assignment brief or rubric for a named style.
- Look in the module or program handbook.
- Look at a journal in your field; its style is often the department's default.
- Ask your instructor if nothing is stated.
Once you know the style, learn its rules for the source types you use most. Consistency matters more than memorizing every rule.
When You Move Between Courses
Joint honors and interdisciplinary students often switch types from one module to the next: APA for a psychology report, footnotes for a history essay, IEEE for a computing project. Keep one master record of each source with every detail, then format it for each assignment. Re-entering details each time is where errors creep in.
Common Mistakes with Citation Types
- Mixing types, such as footnotes for some sources and author-date for others.
- Ordering a numeric reference list alphabetically.
- Using an author-date list with numeric markers in the text.
- Repeating full notes instead of short notes after the first citation.
- Assuming "Chicago" always means footnotes.
How Bibloq Helps with Citations of Every Type
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Frequently Asked Questions
Three main types: author-date, numeric and notes. MLA's author-page format is a close variant of author-date.
No, not for citing sources. Use one system throughout, although author-date papers may include occasional explanatory footnotes.
Author-date styles such as APA or Harvard are often easiest, because adding or moving sources does not affect any numbering.
An in-text citation in brackets, such as (Rivera, 2022). It is the standard form in author-date styles and MLA.
It can be. In note styles, footnotes carry the citation. In other styles, footnotes are used for explanations rather than sources.
Author-date. Sources are cited as (Author, Year) and listed alphabetically.
Numeric. Sources are cited as [1], [2] and listed in order of first citation.
Both, as two separate systems. History and humanities usually use notes; sciences and social sciences may use author-date.
A reference list includes only sources you cited. A bibliography may also list sources you consulted, and is the usual term in Chicago notes-bibliography.