To cite package ‘countryscales’ in publications use:

  Moog S, scales authors (2026). _countryscales: Country Scales_. R
  package version 0.3.0,
  <https://CRAN.R-project.org/package=countryscales>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {countryscales: Country Scales},
    author = {Stefan Moog and {scales authors}},
    year = {2026},
    note = {R package version 0.3.0},
    url = {https://CRAN.R-project.org/package=countryscales},
  }