Merge, join, concatenate and compare, pandas development team, 2024 - The official, comprehensive guide to combining pandas DataFrames and Series, detailing concat, merge, and join with examples.
Python Data Science Handbook: Essential Tools for Working with Data, Jake VanderPlas, 2016 (O'Reilly Media) - A widely respected guide for data science with Python, providing clear explanations and examples of pandas concat, merge, and join operations (see Chapters 3.6 and 3.7).