To cite package ‘historydata’ in publications use:

  Mullen L, Le H (2025). _historydata: Datasets for Historians_. R
  package version 0.3.0, <https://github.com/ropensci/historydata>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {historydata: Datasets for Historians},
    author = {Lincoln Mullen and Hien Le},
    year = {2025},
    note = {R package version 0.3.0},
    url = {https://github.com/ropensci/historydata},
  }