A nice touch in this textbook is the list of key people and their contributions.
Learning Agile: Understanding Scrum, XP, Lean, and Kanban – VERY GOOD
This unbranded textbook is a good option if you are looking for a secondary text.
CBT + DBT + ACT Workbook: 7 Books in 1: Cognitive Behavioral Therapy Jefferson
You will find that this training guide is durable enough for daily use.
