To cite package ‘ggfourfold’ in publications use:

  Klorfine G, Friendly M (2026). _ggfourfold: Fourfold Displays for
  'ggplot2'_. R package version 0.1.0,
  <https://github.com/gklorfine/ggfourfold>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ggfourfold: Fourfold Displays for 'ggplot2'},
    author = {Gavin Klorfine and Michael Friendly},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/gklorfine/ggfourfold},
  }