AMA Citation Style Guide
AMA In-Text Citation: Superscript Numbers and Examples
AMA in-text citations use numbered references, commonly shown as superscript Arabic numerals. Each source receives a number when it is first cited, and that same number is reused whenever the source appears again. The reference list is arranged numerically in the same order rather than alphabetically.
If you already have a DOI, PMID, PubMed URL, ISBN, webpage URL or article title, use the AMA Citation Generator to create the reference and its corresponding in-text number. This guide explains how those numbers should work inside your writing.
AMA in-text citations at a glance
| Question | AMA approach |
|---|---|
| What appears in the text? | A reference number, commonly formatted as a superscript Arabic numeral |
| How is the first source numbered? | 1 |
| How is the second new source numbered? | 2 |
| What happens when source 1 is cited again? | Reuse 1 |
| How is the reference list ordered? | By first appearance in the text |
| Is the reference list alphabetical? | No |
What is an AMA in-text citation?
An AMA in-text citation is the number that connects a statement in your manuscript to a full source in the reference list. Instead of inserting an author surname and year into the sentence, AMA uses a numerical reference system.
Previous studies reported a similar association.1
The superscript 1 tells the reader to look at reference 1 in the numbered reference list.
For the complete citation system, including source formatting, see the AMA 11th edition format guide.
How are AMA citation numbers assigned?
Number sources in the order they first appear in your text. The first new source cited is reference 1, the second new source is reference 2, and so on.
Suppose a paragraph uses three different sources in this order:
- Smith article
- Jones article
- Brown report
Their citation numbers become 1, 2 and 3 in that order. The reference list follows the same sequence.
This is one of the biggest differences between AMA and author-date styles: AMA numbering depends on citation order, not alphabetical order.
What number do you use when citing the same source again?
Reuse the source’s original reference number. Do not assign a new number every time the source is mentioned.
The first analysis used a multicenter design.1
A later section may discuss another finding from the same study.1
Both citations point to the same full reference. The second mention does not create reference 2.
This is why a citation tool needs to manage a reference list rather than simply produce disconnected citations. Our generator detects duplicate sources and keeps references linked to their list position.
When does a source get a new AMA number?
A source gets a new number when it appears for the first time and is not already represented in your reference list.
Study A reported improved adherence.1 Study B found a similar effect in another population.2 A later analysis again cited Study A.1
Study A → 1Study B → 2Study A again → 1
How do you cite multiple sources in AMA style?
When more than one source supports the same statement, multiple reference numbers can be cited together. The exact punctuation and range presentation should follow the current AMA guidance or the house style of the journal, university or publisher receiving your work.
Several studies support this conclusion.1,2,4
When a continuous series of references is cited, many AMA-style implementations use a range rather than listing every number individually. Before final submission, confirm the preferred treatment in the instructions that apply to your manuscript.
Where does the superscript citation go relative to punctuation?
AMA reference numbers are integrated into the sentence as superscripts. Placement can depend on the surrounding punctuation and sentence structure, so this is an area where you should follow the current AMA Manual and the specific publication’s house style rather than rely on a generic rule copied from another citation system.
For ordinary end-of-sentence citations, you will commonly see the reference number placed with the closing punctuation in a form such as:
The intervention improved adherence.1
If you are dealing with quotations, parenthetical material, multiple clauses, colons, semicolons or unusual punctuation, verify the exact placement required by the destination journal or instructor.
How do page numbers work in AMA in-text citations?
Page or location information may be useful when directing readers to a specific part of a source, particularly for quotations or precise passages. The exact way a page locator should be presented can depend on context and publication requirements.
Do not create a second reference-list entry merely because you cite a different page from the same source. The underlying source remains the same reference number.
When a journal, course or publisher gives its own instruction for page locators in AMA-style work, follow that instruction.
How do in-text numbers connect to the AMA reference list?
Every in-text reference number should correspond to a full reference-list entry. If your manuscript uses references 1 through 12, the reference list should contain the matching numbered sources.
In text: The association has been reported previously.3
The reader should then be able to locate source 3 in the reference list.
Learn more about ordering, numbering and list structure in the AMA reference page guide.
What happens if you add a new source earlier in the document?
If a new source is inserted before existing citations, later reference numbers may need to change so that the sequence still reflects first appearance.
Source A → 1Source B → 2Source C → 3
If a new Source X is introduced before Source A:
Source X → 1Source A → 2Source B → 3Source C → 4
This is why reference-management software and numbered citation tools are useful for longer manuscripts: manual renumbering can become error-prone.
How the AMA Citation Generator handles in-text numbers
The AMA Citation Generator generates the full reference and displays the source’s superscript in-text number. When you add a source to the reference list, the tool can keep that source associated with its current list position.
The current workflow also supports:
- DOI lookup;
- direct PMID lookup;
- PubMed URL resolution;
- ISBN lookup;
- webpage URL metadata;
- article-title search;
- PDF and BibTeX import;
- duplicate detection;
- reference reordering and renumbering;
- copying an individual superscript number.
For the technical workflow and metadata sources, see Methodology & Data Sources.
Does a PMID become the AMA in-text citation number?
No. A PMID and an AMA reference number serve different purposes.
A PMID is PubMed’s unique identifier for a record, for example PMID: 39874211. It can help the generator identify the correct article, but it does not become the citation number in your manuscript. If that article is the first source you cite, its AMA in-text number is simply 1.
Read our AMA PubMed and PMID citation guide for the distinction between PMID, DOI, PubMed URLs and the final AMA reference.
Does a DOI appear in the in-text citation?
Normally, the DOI belongs to the full journal reference rather than replacing the AMA citation number in the text. The 11th-edition References chapter recommends including a DOI for journal references when one is available.
DOI → identify article → create full reference → assign AMA reference number
The in-text citation still points to the numbered reference-list entry.
AMA in-text citation examples
One source
The treatment reduced symptom severity.1
Same source cited again
The same investigators later reported improved adherence.1
New second source
A separate cohort produced a similar result.2
Author named in the sentence
Garcia et al3 found a comparable association.
Several supporting sources
Multiple studies have reported similar findings.1,2,4
These examples demonstrate the numbering logic. Always check the current AMA guidance and any specific instructions from your journal, school or publisher for detailed punctuation and locator conventions.
Common AMA in-text citation mistakes
Starting a new number for a repeated source
A source should keep its original number when cited again.
Alphabetizing the reference list
AMA is based on first citation order, so alphabetizing the list can break the connection between the text and the references.
Using the PMID as the in-text number
A PMID identifies a PubMed record. It is not the AMA reference number used in your manuscript.
Using the DOI as the in-text citation
A DOI identifies the scholarly work and may appear in the full reference. The in-text citation remains numerical.
Renumbering only the reference list
If reference order changes, the matching numbers in the text must stay synchronized with the list.
Assuming every publisher follows identical presentation details
AMA provides the citation framework, but journals and universities may apply additional house-style requirements.
AMA in-text citations vs APA in-text citations
| Feature | AMA | APA |
|---|---|---|
| In-text identifier | Number | Author and year |
| Common visual form | Superscript Arabic numeral | Parenthetical or narrative author-date |
| Reference-list order | First citation order | Alphabetical by author |
| Repeated source | Reuse same number | Reuse author-date citation |
Which AMA edition should you follow?
The current AMA Manual of Style is the 11th edition, published in 2020. Oxford Academic also maintains an official updates page because the online manual continues to receive policy and style changes.
For example, the updates page shows that Chapter 3 gained new short-form reference guidance in May 2026 for space-limited formats such as posters and slide presentations.
Read AMA 11th edition explained for the edition history and update process.
What does the full reference look like?
The in-text number is only one half of the citation system. The reference list contains the full source.
In text: Technical translation has been discussed in related disciplines.1
Reference 1: Kingscott G. Technical translation and related disciplines. Perspectives. 2002;10(4):247-255. doi:10.1080/0907676x.2002.9961449
See AMA citation examples for additional source types.
Frequently asked questions about AMA in-text citations
Does AMA use superscript citations?
AMA references are commonly cited in the text with superscript Arabic numerals that correspond to the numbered reference list.
Do you number AMA references alphabetically?
No. Reference numbers follow the order in which sources are first cited.
Do you reuse the same AMA citation number?
Yes. When the same source is cited again, reuse its original reference number.
What is the first AMA citation number?
The first new source cited in the manuscript is reference 1.
Can one sentence have more than one AMA citation?
Yes. Multiple sources can support the same statement and their reference numbers can be cited together. Follow the applicable AMA or house-style rules for punctuation and ranges.
Is PMID the same as an AMA citation number?
No. PMID is a PubMed identifier. The AMA citation number is based on the source’s position in your manuscript’s reference sequence.
Is DOI the same as an AMA in-text citation?
No. A DOI identifies a work and is typically included in the full journal reference when available. The in-text citation remains a reference number.
Should I check my journal’s instructions?
Yes. A journal, university or publisher may apply additional house-style requirements even when AMA is the underlying citation system.
