To cite package ‘historydata’ in publications use:

  Mullen L (2024). _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},
    year = {2024},
    note = {R package version 0.3.0, 
},
    url = {https://github.com/ropensci/historydata},
  }