References

Axis Maps. (2020). Choropleth maps. https://www.axismaps.com/guide/choropleth

Bertin, J. (1967). Sémiologie graphique: Les diagrammes, les réseaux, les cartes. Gauthier-Villars.

Borland, D., & Taylor, R. M. (2007). Rainbow color map (still) considered harmful. IEEE Computer Graphics and Applications, 27(2), 14–17. https://doi.org/10.1109/MCG.2007.323435

Dent, B. D., Torguson, J. S., & Hodler, T. W. (2009). Cartography: Thematic map design (6th ed.). McGraw-Hill.

Kraak, M.-J., & Ormeling, F. (2020). Cartography: Visualization of geospatial data (4th ed.). CRC Press.

LibreTexts Geosciences. (2025). Map types. https://geo.libretexts.org/Bookshelves/Geography_(Physical)/GIS_Commons/06:_Output/6.03:_Map_Types

Monmonier, M. (2018). How to lie with maps (3rd ed.). University of Chicago Press.

Slocum, T. A., McMaster, R. B., Kessler, F. C., & Howard, H. H. (2009). Thematic cartography and geovisualization (3rd ed.). Pearson Prentice Hall.

Wikipedia contributors. (2026). Choropleth map. https://en.wikipedia.org/wiki/Choropleth_map