To cite package ‘earthtones’ in publications use:

  Cornwell W, Lyons M, Murray N (2025). _earthtones: Derive a Color
  Palette from a Particular Location on Earth_. R package version
  0.2.0, <https://github.com/traitecoevo/earthtones>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {earthtones: Derive a Color Palette from a Particular Location on Earth},
    author = {Will Cornwell and Mitch Lyons and Nick Murray},
    year = {2025},
    note = {R package version 0.2.0},
    url = {https://github.com/traitecoevo/earthtones},
  }