Fundamentals of Data Visualization, Claus O. Wilke, 2019 (O'Reilly Media) - Provides principles for effective data visualization, including dedicated sections on visualizing different data types, such as categorical data.
Categorical plots, Seaborn development team, 2023 - Official documentation explaining Seaborn's specialized functions for plotting categorical data, detailing their usage and the types of insights they provide.
OpenIntro Statistics, David M. Lane, David Scott, Mine Çetinkaya-Rundel, Anna Barry, Christopher B. Barr, 2019 (OpenIntro) - Provides a comprehensive introduction to statistics, including fundamental concepts of data types, measurement scales, and their importance in analysis.