How to Reference R Software in a Paper (Citation Guide)

Eric DawsonByEric Dawson Computers & Software

To answer how to reference r software, run citation() with no arguments for base R and use the citation it returns, or run citation(“pkgname”) for an R package. R version 4.6.1, “Happy Hop,” was released on 2026-06-24, so record that version when a journal or reproducibility policy asks for exact software details.

Package authors can also supply tailored citation metadata through a package CITATION file, and the generated output may include more than one bibentry. For added precision, note the package versions used in the analysis, since R and its add-on packages can each have their own citation information.

How to Reference R Software Directly

R software is cited by running citation() with no arguments for the base system, then using the citation details it returns in the paper’s reference list. For an R package, run citation(“pkgname”) and replace pkgname with the package name.

That command pair is the direct route because R’s own citation guidance tells users to ask the software for its citation information instead of reconstructing it from memory. Package citation output is the starting point for the reference entry, since the official documentation points authors to citation() for both base R and package citation details.

Reference wording should follow the citation information generated for the version or package actually used in the analysis. When version-specific reporting is required, record the relevant details alongside the citation entry.

Some packages can supply extra citation detail through a CITATION file in the package directory, so the generated package citation is not always limited to the basic metadata-derived form.

Version tracking matters because the R Project lists R 4.6.1, “Happy Hop,” with a release date of 2026-06-24, and the R Extensions manual is written for that version and date. If a paper needs a precise software record, use the exact version information together with the citation output from citation() or citation(“pkgname”).

What to Cite for Base R

Base R should be cited with citation(). That command returns the citation information for the base R system, so the paper should use that output rather than building a citation by hand.

Because the command takes no package-name argument, it points to the base system only. R’s official guidance says to run citation() without arguments when the goal is to cite base R in publications, and the citation output is the right starting point for a reference-list entry.

Version Details That Matter

Version information matters for a precise software record. The R Extensions manual is written for the same version and date.

Another release listed by the R Project is R 4.5.3, “Reassured Reassurer,” with a wrap-up release date of 2026-03-11. If the paper needs the exact R version used in an analysis, that version should be recorded alongside the citation output from citation().

Further context comes from the R FAQ, which says citation strings or BibTeX entries can be generated for R and for R packages. The same page does not explicitly state the current R version on its “Citing R” page as of September 2026, so a release number should come from the R Project release listing rather than from that page.

Commercial use does not change the citation step. R is free software that may be redistributed and/or modified under terms described by the Free Software Foundation, and the R FAQ says R may be used for commercial purposes, but the citation command for base R remains citation() with no arguments.

If I were writing the paper, I would use citation() for base R and not try to rebuild the reference from the software name alone. I would also record the R version beside it when the paper needs a precise software record. That keeps the base system citation clear and avoids mixing it with package citation rules.

How to Cite an R Package

That command differs from the base R system command because it takes a package name and draws on package metadata rather than the default R citation path.

A package’s basic citation comes from its DESCRIPTION file, especially the author and maintainer fields. Every package must include at least one aut author and one cre maintainer, and the maintainer must have an email address, so those fields help shape the citation that R can generate.

Metadata That Can Change the Result

Additional citation detail can live in a package CITATION file inside the package directory. R sources that file, so the file can supply one or more bibentry records and can also include citation(auto = meta) for an automatically generated package citation.

Citation situation What to inspect or run What it can add
Standard package citation citation(“pkgname”) A basic citation built from DESCRIPTION metadata
Package citation file CITATION in the package directory One or more bibentry records
Generated citation inside the file citation(auto = meta) An automatically generated citation from metadata
Package website URL field A website link, with multiple URLs separated by a comma
Bug tracker BugReports field The submission page for bug reports

For example, mgcv shows a CITATION file with more than one bibentry, while nlme shows a file that includes citation(auto = meta). URLs can also appear in auto-generated package citations when the package metadata includes them, so the output may carry more than the minimum author and title details.

Because package listings can truncate titles beyond 65 characters, the Title field should stay short, use plain text, and avoid a final period. Likewise, the Description field is meant for a one-paragraph summary, uses lines no more than 80 characters wide, and requires subsequent lines to be indented by four spaces, so those fields can influence how a package is presented even before citation text is generated.

When the paper uses an installed package, the generated citation is the best starting point for the reference list entry. If the package includes tailored citation metadata, that output can be richer than the basic metadata-derived form, so the safest approach is to use the package’s own citation information rather than guessing from the package name alone.

What the Citation Output Should Cover

Reference both R and any add-on packages that shaped the analysis. Base R belongs in the reference list through the output of citation(), and each package used in the work should be handled with citation(“pkgname”) for the relevant package name.

Including only the language runtime leaves out part of the software stack. Package citation output can differ from the base system and can also differ from package to package, because some packages rely on the basic metadata in DESCRIPTION while others provide tailored citation details through a CITATION file.

Base R and Package Citations

When the analysis used R plus add-ons, the reference list should reflect both layers rather than collapsing them into one entry. R documentation separates the two cases clearly: citation() with no arguments is for the base R system, while citation(“pkgname”) is for a package citation.

Package output may include more than a single standard entry, so the citation text should be copied with care.

What to Check Before Submission

Before sending a paper, compare the citation output with the actual software used in the analysis. The R distribution includes about 30 packages, so a project may rely on both packages bundled with R and separately installed packages, and each one can carry its own citation details.

When required, record the package versions used in the analysis.

How to Record Version Details

Beyond that, Version detail matters whenever a paper, journal, or reproducibility policy asks for it.

For a plain version note, the release listing gives the R version to save, and the R Extensions manual confirms the 4.6.1 release date. That pairing helps keep the version record tied to the exact software state used for the work.

What to Save

Package versions deserve the same treatment when an analysis depends on package behavior, because package citation information comes from package metadata and package contents can change over time. Packages can also supply tailored citation information through a CITATION file.

At minimum, note the R version and the versions of every package that affected the analysis, since the citation workflow for packages relies on the package name and its metadata. When a journal asks for version-specific reporting, that record should be exact rather than approximate.

  1. Record the R version exactly as released.
  2. List each package version used in the analysis.
  3. Keep the version record with the analysis notes.
  4. Use the same version details in the paper when reporting reproducibility.

For papers that need a version reference, the R Project release listing is the place to use for the R version itself. Package versions should be written down in the same way, so the reported analysis can be matched to the software state that produced it.

When Package Metadata Changes the Citation

That matters when the generated citation needs to reflect more than the default metadata.

Inside an installed package, CITATION is an R-processed file that can contain one or more bibentry records. Those examples show that package authors can shape the citation that users see.

Package Files Versus Repository Files

Repository citation metadata is different. A CITATION.cff file is plain-text citation metadata at the repository level, and tools such as GitHub, Zenodo, and Zotero can use it. By contrast, R sources a package CITATION file from the package directory, so the two mechanisms serve different layers of software description.

For readers of a paper, that distinction affects which citation text should guide the reference entry. The R documentation directs users to citation() for the base system and to citation(“pkgname”) for a package, and the package may return more than the basic metadata-derived form if its CITATION file adds detail. When a package author includes an automatically generated citation in that file, the output can also include URLs if those URLs are present in the generated citation.

Why the Difference Matters

Repository-level metadata can answer software-citation questions about the software name, the version label, and the people to cite as authors, but that information is not the same as the citation workflow R uses for an installed package. The result is that a package citation can be richer than the minimal metadata from DESCRIPTION, while a repository citation file can support cross-platform tools and deposit services. Journal formatting can still require adaptation, but the starting point remains the citation generated by the package itself or by the base R system.

What Journal Style Can Change

Journal style can change the final shape of an R reference, but it does not change the underlying citation information. A journal may ask for a different order, punctuation, capitalization, or placement of version details, while the citation itself still comes from the R output.

Reference-list rules often decide where the software name sits, how the release date appears, and whether package names need extra wording. Some journals also expect software entries to match the style used for books, articles, or online resources, which can affect how the citation reads on the page.

Formatting Points That May Differ

Spacing and punctuation are common points of change. A target journal may prefer abbreviated labels, italic text, or a specific way of separating author names from the software title. Another style may ask for a different treatment of edition or version information, even when the same R release is being cited.

Package references can shift as well. One journal may want only the package name and version, while another may keep the full citation output intact. When a package has tailored citation metadata, that detail can remain the basis of the entry even if the surrounding format changes to fit the journal template.

Formatting should follow the publication’s own reference rules after the correct R citation has been identified. A manuscript may place the software entry in the reference list, the methods section, or both, if the journal asks for that arrangement. Consistency across every software entry matters more than copying the citation output word for word.

Frequently Asked Questions

What Command Should I Use to Cite Base R?

Use citation() with no arguments to get the information for citing the base R system. R’s official citation guidance says that this is the command for the base system, and the output is the right starting point for a reference-list entry.

How Do I Cite an R Package in a Paper?

Run citation(“pkgname”), replacing pkgname with the package name. That command generates a basic package citation from the package metadata in DESCRIPTION, and a package may also provide tailored citation details through a CITATION file.

Should I Use the Exact R Version in My Reference List?

Use the exact R version if a journal or reproducibility policy requires version-specific reporting. R version 4.6.1, “Happy Hop,” was released on 2026-06-24, so that is the version and release date to record when version details matter.

What Is the Difference Between an R Package CITATION File and a CITATION.cff File?

An R package CITATION file lives in the package directory and is sourced by R to create citation information. A CITATION.cff file is repository-level citation metadata that is plain text, human- and machine-readable, and used by tools such as GitHub, Zenodo, and Zotero.

Can R Generate BibTeX for Software Citations?

Yes. The R FAQ states that citation strings or BibTeX entries can be generated for R and for R packages, and the official citation workflow directs users to citation() for both base R and package citation information.

For a paper, start with the citation that R returns for base R or for each package, then adjust only if the target journal asks for a different format. Record the exact R version and package versions when reproducibility rules call for it, and remember that a package can supply more than one citation entry through its CITATION file. That keeps the reference accurate without guessing at metadata or building a citation by hand.

References

Sources read in September 2026.

Eric Dawson

I'm Eric Dawson, and I write The Money Watch from north Columbus, Ohio. Most of what I cover comes from my own life: renting, a 2014 Honda Fit, parking, computers, food and the bills behind all of it. I spent four years in an apartment-property office and eleven on a distributor's operations desk, reading leases and invoices. Where you need real information, I research the maker's or agency's own page and independent sources and report what they publish. I don't give tax, investment, legal or medical advice.