To cite package ‘marble’ in publications use:

  Uryu S (2024). _marble: Coloring for Categorical Variables_. R
  package version 0.0.0.9000, <https://github.com/uribo/sazareishi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {marble: Coloring for Categorical Variables},
    author = {Shinya Uryu},
    year = {2024},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/uribo/sazareishi},
  }