To cite package ‘ggCheysson’ in publications use:

Friendly M (2026). ggCheysson: Graphic Styles of Emile Cheysson for 'ggplot2'. R package version 1.0.0, https://github.com/friendly/ggcheysson.

Corresponding BibTeX entry:

  @Manual{,
    title = {ggCheysson: Graphic Styles of Emile Cheysson for
      'ggplot2'},
    author = {Michael Friendly},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://github.com/friendly/ggcheysson},
  }