To cite khroma in publications use:

Nicolas Frerebeau (2018). khroma: Colour Schemes for Archaeological Data Visualization. Université Bordeaux Montaigne. R package version 1.0.0 URL http://github.com/nfrerebeau/khroma.

Corresponding BibTeX entry:

  @Manual{,
    title = {khroma: Colour Schemes for Archaeological Data
      Visualization},
    author = {Nicolas Frerebeau},
    year = {2018},
    organization = {Université Bordeaux Montaigne},
    address = {Pessac, France},
    note = {R package version 1.0.0},
    url = {http://github.com/nfrerebeau/khroma},
  }