To cite package 'colourlovers' in publications use:

Thomas J. Leeper (2019). colourlovers: R client for the COLOURlovers API. R package version 0.3.5.

Corresponding BibTeX entry:

  @Manual{,
    title = {colourlovers: R client for the COLOURlovers API},
    author = {Thomas J. Leeper},
    year = {2019},
    note = {R package version 0.3.5},
  }