To cite package ‘PortinariColors’ in publications use:

  Lopes R (2026). _PortinariColors: Color Palettes Inspired by the
  Paintings of Candido Portinari_. R package version 0.3.0.9000,
  <https://github.com/rafalopespx/portinaricolors>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PortinariColors: Color Palettes Inspired by the Paintings of Candido Portinari},
    author = {Rafa Lopes},
    year = {2026},
    note = {R package version 0.3.0.9000},
    url = {https://github.com/rafalopespx/portinaricolors},
  }