Poorthuis, Ate, Lucas van der Zee, Grace Guo, Jo Hsi Keong, and Bianchi Dy. “Florence: A Web-Based Grammar of Graphics for Making Maps and Learning Cartography”. Cartographic Perspectives, no. 96 (December 2, 2020): 32–50. Accessed March 28, 2024. https://cartographicperspectives.org/index.php/journal/article/view/1645.