To cite khroma in publications please use:

Nicolas Frerebeau (2019). khroma: Colour Schemes for Archaeological Data Visualization. R package version 1.1.1. https://CRAN.R-project.org/package=khroma

Corresponding BibTeX entry:

  @Manual{,
    title = {khroma: Colour Schemes for Archaeological Data
      Visualization},
    author = {Nicolas Frerebeau},
    year = {2019},
    note = {R package version 1.1.1},
    url = {https://CRAN.R-project.org/package=khroma},
  }