Janet Gregory and I have co-written three books:
Agile Testing Condensed: A Brief Introduction
Agile Testing: A Practical Guide for Testers and Agile Teams
More Agile Testing: Learning Journeys for the Whole Team
Please see our book website for lots of information about our books, including book mind maps and sample chapters.
Each book has unique content. The Condensed book refers to the other two books for more in-depth information on some topics, as well as many other useful resources.