To cite colorspace in publications use

Zeileis A, Fisher JC, Hornik K, Ihaka R, McWhite CD, Murrell P, Stauffer R, Wilke CO (2019). “colorspace: A Toolbox for Manipulating and Assessing Colors and Palettes.” Technical Report 1903.06490, arXiv.org E-Print Archive. http://arxiv.org/abs/1903.06490.

If you use HCL-based color palettes, please cite:

Zeileis A, Hornik K, Murrell P (2009). “Escaping RGBland: Selecting Colors for Statistical Graphics.” Computational Statistics \& Data Analysis, 53(9), 3259–3270. doi: 10.1016/j.csda.2008.11.033.

If you use HCL-based color palettes in meteorological visualizations, please cite:

Stauffer R, Mayr GJ, Dabernig M, Zeileis A (2009). “Somewhere over the Rainbow: How to Make Effective Use of Colors in Meteorological Visualizations.” Bulletin of the American Meteorological Society, 96(2), 203–216. doi: 10.1175/BAMS-D-13-00155.1.

Corresponding BibTeX entries:

  @TechReport{,
    title = {{colorspace}: A Toolbox for Manipulating and Assessing
      Colors and Palettes},
    author = {Achim Zeileis and Jason C. Fisher and Kurt Hornik and
      Ross Ihaka and Claire D. McWhite and Paul Murrell and Reto
      Stauffer and Claus O. Wilke},
    year = {2019},
    institution = {arXiv.org E-Print Archive},
    type = {arXiv},
    number = {1903.06490},
    month = {March},
    url = {http://arxiv.org/abs/1903.06490},
  }

  @Article{,
    title = {Escaping {RGB}land: Selecting Colors for Statistical
      Graphics},
    author = {Achim Zeileis and Kurt Hornik and Paul Murrell},
    journal = {Computational Statistics \& Data Analysis},
    year = {2009},
    volume = {53},
    number = {9},
    pages = {3259--3270},
    doi = {10.1016/j.csda.2008.11.033},
  }

  @Article{,
    title = {Somewhere over the Rainbow: How to Make Effective Use of
      Colors in Meteorological Visualizations},
    author = {Reto Stauffer and Georg J. Mayr and Markus Dabernig and
      Achim Zeileis},
    journal = {Bulletin of the American Meteorological Society},
    year = {2009},
    volume = {96},
    number = {2},
    pages = {203--216},
    doi = {10.1175/BAMS-D-13-00155.1},
  }