To cite package ‘metallicaRt’ in publications use:

MacKintosh J (2023). metallicaRt: Colour palettes based on Metallica studio album covers. R package version 0.0.0.9000, https://github.com/johnmackintosh/metallicart.

Corresponding BibTeX entry:

  @Manual{,
    title = {metallicaRt: Colour palettes based on Metallica studio
      album covers},
    author = {John MacKintosh},
    year = {2023},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/johnmackintosh/metallicart},
  }