To cite package ‘Guerry’ in publications use:

Friendly M, Dray S (2026). Guerry: Maps, Data and Methods Related to Guerry (1833) "Moral Statistics of France". R package version 1.8.4, https://github.com/friendly/guerry.

Corresponding BibTeX entry:

  @Manual{,
    title = {Guerry: Maps, Data and Methods Related to Guerry (1833)
      "Moral Statistics of France"},
    author = {Michael Friendly and Stephane Dray},
    year = {2026},
    note = {R package version 1.8.4},
    url = {https://github.com/friendly/guerry},
  }