To cite package ‘RcppColors’ in publications use:

  Laurent S, Spencer S (2023). _RcppColors: Color Mappings and 'C++'
  Header Files for Color Conversion_. R package version 0.6.0,
  <https://CRAN.R-project.org/package=RcppColors>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {RcppColors: Color Mappings and 'C++' Header Files for Color Conversion},
    author = {Stéphane Laurent and Scott Spencer},
    year = {2023},
    note = {R package version 0.6.0},
    url = {https://CRAN.R-project.org/package=RcppColors},
  }