To cite package ‘keylist’ in publications use:

  Jenkins L (2026). _keylist: Lightweight List Extensions that Enforce
  Unique Keys_. R package version 1.0.0.9000,
  <https://github.com/lj-jenkins/keylist>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {keylist: Lightweight List Extensions that Enforce Unique Keys},
    author = {Luke Jenkins},
    year = {2026},
    note = {R package version 1.0.0.9000},
    url = {https://github.com/lj-jenkins/keylist},
  }