To cite paletteer in publications use:

  Hvitfeldt E. (2021). paletteer: Comprehensive Collection of Color
  Palettes. version 1.3.0. https://github.com/EmilHvitfeldt/paletteer

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {paletteer: Comprehensive Collection of Color Palettes},
    author = {Emil Hvitfeldt},
    year = {2021},
    note = {R package version 1.3.0},
    url = {https://github.com/EmilHvitfeldt/paletteer},
  }