cffr

cffr provides utilities to generate, coerce, modify and validate CITATION.cff files automatically for R packages, as well as tools and examples for working with .cff more generally.

What is a `CITATION.cff` file?

Citation File Format (CFF) (Druskat et al. 2021) (v1.2.0) are plain text files with human- and machine-readable citation information for software (and datasets). Code developers can include them in their repositories to let others know how to correctly cite their software.

This format is becoming popular within the software citation ecosystem. Recently GitHub, Zenodo and Zotero have included full support of this citation format (Druskat 2021). GitHub support is of special interest:

— Nat Friedman (@natfriedman) July 27, 2021

See Enhanced support for citations on GitHub (Smith 2021) for more info.

Related projects

The CodeMeta Project (Jones et al. 2017) creates a concept vocabulary that can be used to standardize the exchange of software metadata across repositories and organizations. One of the many uses of a codemeta.json file (created following the standards defined on The CodeMeta Project) is to provide citation metadata such as title, authors, publication year, and venue (Fenner 2021). The packages codemeta (Boettiger and Salmon 2021a) / codemetar (Boettiger and Salmon 2021b) allows to generate codemeta.json files from R packages metadata.

The cffr package

cffr maximizes the data extraction by using both the DESCRIPTION file and the CITATION file (if present) of your package. Note that cffr works best if your package pass R CMD check/devtools::check().

As per 2024-08-28 there are at least 288 repos on GitHub using cffr. Check them out here.

Installation

Install cffr from CRAN:

install.packages("cffr")

You can install the developing version of cffr with:

remotes::install_github("ropensci/cffr")

Alternatively, you can install cffr using the r-universe:

# Install cffr in R:
install.packages("cffr",
  repos = c("https://ropensci.r-universe.dev", "https://cloud.r-project.org")
)

Example

By default most often from within your package folder you’ll simply run cff_write(), that creates a cff object, write it on a CITATION.cff file and validates it on a single command:

library(cffr)

# For in-development packages
cff_write()
#>
#> CITATION.cff generated
#>
#> cff_validate results-----
#> Congratulations! This .cff file is valid

However, cffr provides also custom print methods and mechanisms that allows you to customize the CITATION.cff and integrate them in your workflows.

This is a basic example which shows you how to create a cff object (see ?cff for more info). In this case, we are creating a cff object from the metadata of the rmarkdown package:

library(cffr)

# Example with an installed package
test <- cff_create("rmarkdown")

CITATION.cff for rmarkdown

cff-version: 1.2.0
message: 'To cite package "rmarkdown" in publications use:'
type: software
license: GPL-3.0-only
title: 'rmarkdown: Dynamic Documents for R'
version: '2.28'
identifiers:
- type: doi
  value: 10.32614/CRAN.package.rmarkdown
abstract: Convert R Markdown documents into a variety of formats.
authors:
- family-names: Allaire
  given-names: JJ
  email: [email protected]
- family-names: Xie
  given-names: Yihui
  email: [email protected]
  orcid: https://orcid.org/0000-0003-0645-5666
- family-names: Dervieux
  given-names: Christophe
  email: [email protected]
  orcid: https://orcid.org/0000-0003-4474-2498
- family-names: McPherson
  given-names: Jonathan
  email: [email protected]
- family-names: Luraschi
  given-names: Javier
- family-names: Ushey
  given-names: Kevin
  email: [email protected]
- family-names: Atkins
  given-names: Aron
  email: [email protected]
- family-names: Wickham
  given-names: Hadley
  email: [email protected]
- family-names: Cheng
  given-names: Joe
  email: [email protected]
- family-names: Chang
  given-names: Winston
  email: [email protected]
- family-names: Iannone
  given-names: Richard
  email: [email protected]
  orcid: https://orcid.org/0000-0003-3925-190X
preferred-citation:
  type: manual
  title: 'rmarkdown: Dynamic Documents for R'
  authors:
  - family-names: Allaire
    given-names: JJ
    email: [email protected]
  - family-names: Xie
    given-names: Yihui
    email: [email protected]
    orcid: https://orcid.org/0000-0003-0645-5666
  - family-names: Dervieux
    given-names: Christophe
    email: [email protected]
    orcid: https://orcid.org/0000-0003-4474-2498
  - family-names: McPherson
    given-names: Jonathan
    email: [email protected]
  - family-names: Luraschi
    given-names: Javier
  - family-names: Ushey
    given-names: Kevin
    email: [email protected]
  - family-names: Atkins
    given-names: Aron
    email: [email protected]
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  - family-names: Cheng
    given-names: Joe
    email: [email protected]
  - family-names: Chang
    given-names: Winston
    email: [email protected]
  - family-names: Iannone
    given-names: Richard
    email: [email protected]
    orcid: https://orcid.org/0000-0003-3925-190X
  year: '2024'
  notes: R package version 2.28
  url: https://github.com/rstudio/rmarkdown
repository: https://CRAN.R-project.org/package=rmarkdown
repository-code: https://github.com/rstudio/rmarkdown
url: https://pkgs.rstudio.com/rmarkdown/
date-released: '2024-08-17'
contact:
- family-names: Xie
  given-names: Yihui
  email: [email protected]
  orcid: https://orcid.org/0000-0003-0645-5666
keywords:
- literate-programming
- markdown
- pandoc
- r
- r-package
- rmarkdown
references:
- type: book
  title: 'R Markdown: The Definitive Guide'
  authors:
  - family-names: Xie
    given-names: Yihui
  - family-names: Allaire
    given-names: J.J.
  - family-names: Grolemund
    given-names: Garrett
  publisher:
    name: Chapman and Hall/CRC
    address: Boca Raton, Florida
  year: '2018'
  isbn: '9781138359338'
  url: https://bookdown.org/yihui/rmarkdown
- type: book
  title: R Markdown Cookbook
  authors:
  - family-names: Xie
    given-names: Yihui
  - family-names: Dervieux
    given-names: Christophe
  - family-names: Riederer
    given-names: Emily
  publisher:
    name: Chapman and Hall/CRC
    address: Boca Raton, Florida
  year: '2020'
  isbn: '9780367563837'
  url: https://bookdown.org/yihui/rmarkdown-cookbook
- type: software
  title: 'R: A Language and Environment for Statistical Computing'
  notes: Depends
  url: https://www.R-project.org/
  authors:
  - name: R Core Team
  institution:
    name: R Foundation for Statistical Computing
    address: Vienna, Austria
  year: '2024'
  version: '>= 3.0'
- type: software
  title: bslib
  abstract: 'bslib: Custom ''Bootstrap'' ''Sass'' Themes for ''shiny'' and ''rmarkdown'''
  notes: Imports
  url: https://rstudio.github.io/bslib/
  repository: https://CRAN.R-project.org/package=bslib
  authors:
  - family-names: Sievert
    given-names: Carson
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4958-2844
  - family-names: Cheng
    given-names: Joe
    email: [email protected]
  - family-names: Aden-Buie
    given-names: Garrick
    email: [email protected]
    orcid: https://orcid.org/0000-0002-7111-0077
  year: '2024'
  doi: 10.32614/CRAN.package.bslib
  version: '>= 0.2.5.1'
- type: software
  title: evaluate
  abstract: 'evaluate: Parsing and Evaluation Tools that Provide More Details than
    the Default'
  notes: Imports
  url: https://github.com/r-lib/evaluate
  repository: https://CRAN.R-project.org/package=evaluate
  authors:
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  - family-names: Xie
    given-names: Yihui
    orcid: https://orcid.org/0000-0003-0645-5666
  year: '2024'
  doi: 10.32614/CRAN.package.evaluate
  version: '>= 0.13'
- type: software
  title: fontawesome
  abstract: 'fontawesome: Easily Work with ''Font Awesome'' Icons'
  notes: Imports
  url: https://rstudio.github.io/fontawesome/
  repository: https://CRAN.R-project.org/package=fontawesome
  authors:
  - family-names: Iannone
    given-names: Richard
    email: [email protected]
    orcid: https://orcid.org/0000-0003-3925-190X
  year: '2024'
  doi: 10.32614/CRAN.package.fontawesome
  version: '>= 0.5.0'
- type: software
  title: htmltools
  abstract: 'htmltools: Tools for HTML'
  notes: Imports
  url: https://rstudio.github.io/htmltools/
  repository: https://CRAN.R-project.org/package=htmltools
  authors:
  - family-names: Cheng
    given-names: Joe
    email: [email protected]
  - family-names: Sievert
    given-names: Carson
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4958-2844
  - family-names: Schloerke
    given-names: Barret
    email: [email protected]
    orcid: https://orcid.org/0000-0001-9986-114X
  - family-names: Chang
    given-names: Winston
    email: [email protected]
    orcid: https://orcid.org/0000-0002-1576-2126
  - family-names: Xie
    given-names: Yihui
    email: [email protected]
  - family-names: Allen
    given-names: Jeff
  year: '2024'
  doi: 10.32614/CRAN.package.htmltools
  version: '>= 0.5.1'
- type: software
  title: jquerylib
  abstract: 'jquerylib: Obtain ''jQuery'' as an HTML Dependency Object'
  notes: Imports
  repository: https://CRAN.R-project.org/package=jquerylib
  authors:
  - family-names: Sievert
    given-names: Carson
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4958-2844
  - family-names: Cheng
    given-names: Joe
    email: [email protected]
  year: '2024'
  doi: 10.32614/CRAN.package.jquerylib
- type: software
  title: jsonlite
  abstract: 'jsonlite: A Simple and Robust JSON Parser and Generator for R'
  notes: Imports
  url: https://jeroen.r-universe.dev/jsonlite
  repository: https://CRAN.R-project.org/package=jsonlite
  authors:
  - family-names: Ooms
    given-names: Jeroen
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4035-0289
  year: '2024'
  doi: 10.32614/CRAN.package.jsonlite
- type: software
  title: knitr
  abstract: 'knitr: A General-Purpose Package for Dynamic Report Generation in R'
  notes: Imports
  url: https://yihui.org/knitr/
  repository: https://CRAN.R-project.org/package=knitr
  authors:
  - family-names: Xie
    given-names: Yihui
    email: [email protected]
    orcid: https://orcid.org/0000-0003-0645-5666
  year: '2024'
  doi: 10.32614/CRAN.package.knitr
  version: '>= 1.43'
- type: software
  title: methods
  abstract: 'R: A Language and Environment for Statistical Computing'
  notes: Imports
  authors:
  - name: R Core Team
  institution:
    name: R Foundation for Statistical Computing
    address: Vienna, Austria
  year: '2024'
- type: software
  title: tinytex
  abstract: 'tinytex: Helper Functions to Install and Maintain TeX Live, and Compile
    LaTeX Documents'
  notes: Imports
  url: https://github.com/rstudio/tinytex
  repository: https://CRAN.R-project.org/package=tinytex
  authors:
  - family-names: Xie
    given-names: Yihui
    email: [email protected]
    orcid: https://orcid.org/0000-0003-0645-5666
  year: '2024'
  doi: 10.32614/CRAN.package.tinytex
  version: '>= 0.31'
- type: software
  title: tools
  abstract: 'R: A Language and Environment for Statistical Computing'
  notes: Imports
  authors:
  - name: R Core Team
  institution:
    name: R Foundation for Statistical Computing
    address: Vienna, Austria
  year: '2024'
- type: software
  title: utils
  abstract: 'R: A Language and Environment for Statistical Computing'
  notes: Imports
  authors:
  - name: R Core Team
  institution:
    name: R Foundation for Statistical Computing
    address: Vienna, Austria
  year: '2024'
- type: software
  title: xfun
  abstract: 'xfun: Supporting Functions for Packages Maintained by ''Yihui Xie'''
  notes: Imports
  url: https://github.com/yihui/xfun
  repository: https://CRAN.R-project.org/package=xfun
  authors:
  - family-names: Xie
    given-names: Yihui
    email: [email protected]
    orcid: https://orcid.org/0000-0003-0645-5666
  year: '2024'
  doi: 10.32614/CRAN.package.xfun
  version: '>= 0.36'
- type: software
  title: yaml
  abstract: 'yaml: Methods to Convert R Data to YAML and Back'
  notes: Imports
  url: https://github.com/vubiostat/r-yaml/
  repository: https://CRAN.R-project.org/package=yaml
  authors:
  - family-names: Garbett
    given-names: Shawn P
  - family-names: Stephens
    given-names: Jeremy
  - family-names: Simonov
    given-names: Kirill
  - family-names: Xie
    given-names: Yihui
  - family-names: Dong
    given-names: Zhuoer
  - family-names: Wickham
    given-names: Hadley
  - family-names: Horner
    given-names: Jeffrey
  - name: reikoch
  - family-names: Beasley
    given-names: Will
  - family-names: O'Connor
    given-names: Brendan
  - family-names: Warnes
    given-names: Gregory R.
  - family-names: Quinn
    given-names: Michael
  - family-names: Kamvar
    given-names: Zhian N.
  - family-names: Gao
    given-names: Charlie
  year: '2024'
  doi: 10.32614/CRAN.package.yaml
  version: '>= 2.1.19'
- type: software
  title: digest
  abstract: 'digest: Create Compact Hash Digests of R Objects'
  notes: Suggests
  url: https://dirk.eddelbuettel.com/code/digest.html
  repository: https://CRAN.R-project.org/package=digest
  authors:
  - family-names: Eddelbuettel
    given-names: Dirk
    email: [email protected]
    orcid: https://orcid.org/0000-0001-6419-907X
  year: '2024'
  doi: 10.32614/CRAN.package.digest
- type: software
  title: dygraphs
  abstract: 'dygraphs: Interface to ''Dygraphs'' Interactive Time Series Charting
    Library'
  notes: Suggests
  url: https://github.com/rstudio/dygraphs
  repository: https://CRAN.R-project.org/package=dygraphs
  authors:
  - family-names: Vanderkam
    given-names: Dan
    website: http://dygraphs.com/
  - family-names: Allaire
    given-names: JJ
  - family-names: Owen
    given-names: Jonathan
  - family-names: Gromer
    given-names: Daniel
  - family-names: Thieurmel
    given-names: Benoit
  year: '2024'
  doi: 10.32614/CRAN.package.dygraphs
- type: software
  title: fs
  abstract: 'fs: Cross-Platform File System Operations Based on ''libuv'''
  notes: Suggests
  url: https://fs.r-lib.org
  repository: https://CRAN.R-project.org/package=fs
  authors:
  - family-names: Hester
    given-names: Jim
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  - family-names: Csárdi
    given-names: Gábor
    email: [email protected]
  year: '2024'
  doi: 10.32614/CRAN.package.fs
- type: software
  title: rsconnect
  abstract: 'rsconnect: Deploy Docs, Apps, and APIs to ''Posit Connect'', ''shinyapps.io'',
    and ''RPubs'''
  notes: Suggests
  url: https://rstudio.github.io/rsconnect/
  repository: https://CRAN.R-project.org/package=rsconnect
  authors:
  - family-names: Atkins
    given-names: Aron
    email: [email protected]
  - family-names: Allen
    given-names: Toph
  - family-names: Wickham
    given-names: Hadley
  - family-names: McPherson
    given-names: Jonathan
  - family-names: Allaire
    given-names: JJ
  year: '2024'
  doi: 10.32614/CRAN.package.rsconnect
- type: software
  title: downlit
  abstract: 'downlit: Syntax Highlighting and Automatic Linking'
  notes: Suggests
  url: https://downlit.r-lib.org/
  repository: https://CRAN.R-project.org/package=downlit
  authors:
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  year: '2024'
  doi: 10.32614/CRAN.package.downlit
  version: '>= 0.4.0'
- type: software
  title: katex
  abstract: 'katex: Rendering Math to HTML, ''MathML'', or R-Documentation Format'
  notes: Suggests
  url: https://docs.ropensci.org/katex/
  repository: https://CRAN.R-project.org/package=katex
  authors:
  - family-names: Ooms
    given-names: Jeroen
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4035-0289
  year: '2024'
  doi: 10.32614/CRAN.package.katex
  version: '>= 1.4.0'
- type: software
  title: sass
  abstract: 'sass: Syntactically Awesome Style Sheets (''Sass'')'
  notes: Suggests
  url: https://rstudio.github.io/sass/
  repository: https://CRAN.R-project.org/package=sass
  authors:
  - family-names: Cheng
    given-names: Joe
    email: [email protected]
  - family-names: Mastny
    given-names: Timothy
    email: [email protected]
  - family-names: Iannone
    given-names: Richard
    email: [email protected]
    orcid: https://orcid.org/0000-0003-3925-190X
  - family-names: Schloerke
    given-names: Barret
    email: [email protected]
    orcid: https://orcid.org/0000-0001-9986-114X
  - family-names: Sievert
    given-names: Carson
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4958-2844
  year: '2024'
  doi: 10.32614/CRAN.package.sass
  version: '>= 0.4.0'
- type: software
  title: shiny
  abstract: 'shiny: Web Application Framework for R'
  notes: Suggests
  url: https://shiny.posit.co/
  repository: https://CRAN.R-project.org/package=shiny
  authors:
  - family-names: Chang
    given-names: Winston
    email: [email protected]
    orcid: https://orcid.org/0000-0002-1576-2126
  - family-names: Cheng
    given-names: Joe
    email: [email protected]
  - family-names: Allaire
    given-names: JJ
    email: [email protected]
  - family-names: Sievert
    given-names: Carson
    email: [email protected]
    orcid: https://orcid.org/0000-0002-4958-2844
  - family-names: Schloerke
    given-names: Barret
    email: [email protected]
    orcid: https://orcid.org/0000-0001-9986-114X
  - family-names: Xie
    given-names: Yihui
    email: [email protected]
  - family-names: Allen
    given-names: Jeff
  - family-names: McPherson
    given-names: Jonathan
    email: [email protected]
  - family-names: Dipert
    given-names: Alan
  - family-names: Borges
    given-names: Barbara
  year: '2024'
  doi: 10.32614/CRAN.package.shiny
  version: '>= 1.6.0'
- type: software
  title: testthat
  abstract: 'testthat: Unit Testing for R'
  notes: Suggests
  url: https://testthat.r-lib.org
  repository: https://CRAN.R-project.org/package=testthat
  authors:
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  year: '2024'
  doi: 10.32614/CRAN.package.testthat
  version: '>= 3.0.3'
- type: software
  title: tibble
  abstract: 'tibble: Simple Data Frames'
  notes: Suggests
  url: https://tibble.tidyverse.org/
  repository: https://CRAN.R-project.org/package=tibble
  authors:
  - family-names: Müller
    given-names: Kirill
    email: [email protected]
    orcid: https://orcid.org/0000-0002-1416-3412
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  year: '2024'
  doi: 10.32614/CRAN.package.tibble
- type: software
  title: vctrs
  abstract: 'vctrs: Vector Helpers'
  notes: Suggests
  url: https://vctrs.r-lib.org/
  repository: https://CRAN.R-project.org/package=vctrs
  authors:
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  - family-names: Henry
    given-names: Lionel
    email: [email protected]
  - family-names: Vaughan
    given-names: Davis
    email: [email protected]
  year: '2024'
  doi: 10.32614/CRAN.package.vctrs
- type: software
  title: cleanrmd
  abstract: 'cleanrmd: Clean Class-Less ''R Markdown'' HTML Documents'
  notes: Suggests
  url: https://pkg.garrickadenbuie.com/cleanrmd/
  repository: https://CRAN.R-project.org/package=cleanrmd
  authors:
  - family-names: Aden-Buie
    given-names: Garrick
    email: [email protected]
    orcid: https://orcid.org/0000-0002-7111-0077
  year: '2024'
  doi: 10.32614/CRAN.package.cleanrmd
- type: software
  title: withr
  abstract: 'withr: Run Code ''With'' Temporarily Modified Global State'
  notes: Suggests
  url: https://withr.r-lib.org
  repository: https://CRAN.R-project.org/package=withr
  authors:
  - family-names: Hester
    given-names: Jim
  - family-names: Henry
    given-names: Lionel
    email: [email protected]
  - family-names: Müller
    given-names: Kirill
    email: [email protected]
  - family-names: Ushey
    given-names: Kevin
    email: [email protected]
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  - family-names: Chang
    given-names: Winston
  year: '2024'
  doi: 10.32614/CRAN.package.withr
  version: '>= 2.4.2'
- type: software
  title: xml2
  abstract: 'xml2: Parse XML'
  notes: Suggests
  url: https://xml2.r-lib.org/
  repository: https://CRAN.R-project.org/package=xml2
  authors:
  - family-names: Wickham
    given-names: Hadley
    email: [email protected]
  - family-names: Hester
    given-names: Jim
  - family-names: Ooms
    given-names: Jeroen
  year: '2024'
  doi: 10.32614/CRAN.package.xml2

We can validate the result using cff_validate():

cff_validate(test)
#> ══ Validating cff ══════════════════════════════════════════════════════════════
#> ✔ Congratulations! This <cff> is valid

Check the docs and vignette("cffr", package = "cffr") to learn how to work with cff objects.

Keep your `CITATION.cff` file up-to-date

GitHub Actions

The easiest way for keeping you CITATION.cff file up-to-date is using GitHub Actions. Use cff_gha_update()function to install a GitHub Action that would update your CITATION.cff file on the following events:

When you publish a new release of the package on your GitHub repo.
Each time that you modify your DESCRIPTION or inst/CITATION files.
The action can be run also manually.

cff_gha_update()

#> Installing update-citation-cff.yaml on './.github/workflows'
#> Adding .github to .Rbuildignore

See the example workflow file here.

Git pre-commit hook

You can also use a git pre-commit hook:

The pre-commit hook is run first, before you even type in a commit message. It’s used to inspect the snapshot that’s about to be committed, to see if you’ve forgotten something, to make sure tests run, or to examine whatever you need to inspect in the code. Exiting non-zero from this hook aborts the commit, although you can bypass it with git commit --no-verify.

A specific pre-commit hook can be installed with cff_git_hook_install(). If you want to use a pre-commit hook, please make sure you have the testthat package installed.

Learn more

Check the following articles to learn more about cffr:

Related packages

citation (Dietrich and Leoncio 2022) includes a function r2cff that creates a CITATION.cff file (v1.1.0) using the information of your DESCRIPTION file. It also provide minimal validity checks.
handlr (Chamberlain 2022): Tool for converting among citation formats, including *.cff files.
codemeta (Boettiger and Salmon 2021a) / codemetar (Boettiger and Salmon 2021b) provides similar solutions for creating codemeta.json file, another format for storing and sharing software metadata.

Citation

Hernangómez, D., (2021). cffr: Generate Citation File Format Metadata for R Packages. Journal of Open Source Software, 6(67), 3900, https://doi.org/10.21105/joss.03900

A BibTeX entry for LaTeX users is:

@article{hernangomez2021,
    title        = {{cffr}: Generate Citation File Format Metadata for {R} Packages},
    author       = {Diego Hernangómez},
    year         = 2021,
    journal      = {Journal of Open Source Software},
    publisher    = {The Open Journal},
    volume       = 6,
    number       = 67,
    pages        = 3900,
    doi          = {10.21105/joss.03900},
    url          = {https://doi.org/10.21105/joss.03900}
}

You can also use the citation provided by GitHub, that is generated from the information of a CITATION.cff created with cffr. See About CITATION files for more info.

References

Boettiger, Carl, and Maëlle Salmon. 2021a. codemeta: A Smaller codemetar Package. https://CRAN.R-project.org/package=codemeta.

———. 2021b. codemetar: Generate ’CodeMeta’ Metadata for R Packages.

Chamberlain, Scott. 2022. handlr: Convert Among Citation Formats.

Dietrich, Jan Philipp, and Waldir Leoncio. 2022. citation: Software Citation Tools.

Druskat, Stephan. 2021. “Making Software Citation Easi(er) - The Citation File Format and Its Integrations.” https://doi.org/10.5281/zenodo.5529914.

Druskat, Stephan, Jurriaan H. Spaaks, Neil Chue Hong, Robert Haines, James Baker, Spencer Bliven, Egon Willighagen, David Pérez-Suárez, and Alexander Konovalov. 2021. “Citation File Format.” https://doi.org/10.5281/zenodo.5171937.

Fenner, Martin. 2021. “We Need Your Feedback: Aligning the CodeMeta Vocabulary for Scientific Software with Schema.org.” https://doi.org/10.5438/a49j-x692.

Jones, Matthew B, Carl Boettiger, Abby Cabunoc Mayes, Arfon Smith, Peter Slaughter, Kyle Niemeyer, Yolanda Gil, et al. 2017. CodeMeta: An Exchange Schema for Software Metadata. KNB Data Repository. https://doi.org/10.5063/SCHEMA/CODEMETA-2.0.

Smith, Arfon. 2021. “Enhanced Support for Citations on GitHub.” https://github.blog/news-insights/company-news/enhanced-support-citations-github/.

Name		Name	Last commit message	Last commit date
Latest commit History 690 Commits
.github		.github
R		R
data-raw		data-raw
data		data
inst		inst
man		man
pkgdown		pkgdown
revdep		revdep
tests		tests
vignettes		vignettes
.Rbuildignore		.Rbuildignore
.gitignore		.gitignore
.lintr		.lintr
CITATION.cff		CITATION.cff
CONTRIBUTING.md		CONTRIBUTING.md
DESCRIPTION		DESCRIPTION
LICENSE.md		LICENSE.md
NAMESPACE		NAMESPACE
NEWS.md		NEWS.md
README.Rmd		README.Rmd
README.md		README.md
cffr.Rproj		cffr.Rproj
codemeta.json		codemeta.json

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