Birch, Jennifer. 2012. “Worldwide Prevalence of Red-Green Color Deficiency.” Journal of the Optical Society of America A 29 (3): 313.

Bivand, Roger. 2020. ClassInt: Choose Univariate Class Intervals.

Borland, David, and Russell Taylor Ii. 2007. “Rainbow Color Map (Still) Considered Harmful.” IEEE Computer Graphics and Applications 27 (2): 14–17.

CARTO. 2019. “CARTOColors Data-Driven Color Schemes.”

Chang, Winston. 2014. Extrafont: Tools for Using Fonts.

Coombes, Kevin R., Guy Brock, Zachary B. Abrams, and Lynne V. Abruzzo. 2019. “Polychrome : Creating and Assessing Qualitative Palettes with Many Colors.” Journal of Statistical Software 90 (Code Snippet 1).

Crameri, Fabio. 2018. “Geodynamic Diagnostics, Scientific Visualisation and StagLab 3.0.” Geoscientific Model Development 11 (6): 2541–62.

Fisher, Walter D. 1958. “On Grouping for Maximum Homogeneity.” Journal of the American Statistical Association, 10.

Garnier, Simon. 2018. Viridis: Default Color Maps from ’Matplotlib’.

Guidero, Elaine. 2017. “Typography.” In Geographic Information Science & Technology Body of Knowledge, edited by John P. Wilson. Vol. 2017. University Consortium for Geographic Information Science (UCGIS).

Harrower, Mark, and Cynthia A. Brewer. 2003. “ColorBrewer.Org: An Online Tool for Selecting Colour Schemes for Maps.” The Cartographic Journal 40 (1): 27–37.

Jiang, Bin. 2013. “Head/Tail Breaks: A New Classification Scheme for Data with a Heavy-Tailed Distribution.” The Professional Geographer 65 (3): 482–94.

Lovelace, R, J Nowosad, and J Muenchow. 2019. Geocomputation with R. Chapman and Hall/CRC Press.

Neuwirth, Erich. 2014. RColorBrewer: ColorBrewer Palettes.

Nowosad, Jakub. 2018. ’CARTOColors’ Palettes.

Nuñez, Jamie R., Christopher R. Anderton, and Ryan S. Renslow. 2018. “Optimizing Colormaps with Consideration for Color Vision Deficiency to Enable Accurate Interpretation of Scientific Data.” Edited by Jesús Malo. PLOS ONE 13 (7): e0199239.

Pedersen, Thomas Lin, and Fabio Crameri. 2020. Scico: Colour Palettes Based on the Scientific Colour-Maps.

Pedersen, Thomas Lin, Jeroen Ooms, and Devon Govett. 2021. Systemfonts: System Native Font Finding.

Pedersen, Thomas Lin, and Maxim Shemanarev. 2021. Ragg: Graphic Devices Based on Agg.

Peng, Roger. 2016. Exploratory Data Analysis with R. United States: LeanPub.

Qiu, Yixuan, and authors/contributors of the included software. See file AUTHORS for details. 2021. Showtext: Using Fonts More Easily in R Graphs.

Quinan, P. S., L. M. Padilla, S. H. Creem-Regehr, and M. Meyer. 2019. “Examining Implicit Discretization in Spectral Schemes.” Computer Graphics Forum 38 (3): 363–74.

Sharpe, Lindsay T, Andrew Stockman, Herbert Jägle, and Jeremy Nathans. 1999. “Opsin Genes, Cone Photopigments, Color Vision, and Color Blindness.” In Color Vision: From Genes to Perception, edited by T Gegenfurtner and Lindsay T Sharpe, 50. Cambridge: Cambridge University Press.

Stauffer, Reto, Georg J. Mayr, Markus Dabernig, and Achim Zeileis. 2015. “Somewhere over the Rainbow: How to Make Effective Use of Colors in Meteorological Visualizations.” Bulletin of the American Meteorological Society 96 (2): 203–16.

Šavrič, Bojan, Tom Patterson, and Bernhard Jenny. 2019. “The Equal Earth Map Projection.” International Journal of Geographical Information Science 33 (3): 454–65.

Wand, M. P. 1997. “Data-Based Choice of Histogram Bin Width.” The American Statistician 51 (1): 59.

Zeileis, Achim, Jason C. Fisher, Kurt Hornik, Ross Ihaka, Claire D. McWhite, Paul Murrell, Reto Stauffer, and Claus O. Wilke. 2019. “colorspace: A Toolbox for Manipulating and Assessing Colors and Palettes.” ArXiv 1903.06490. E-Print Archive.