Scrum: a Breathtakingly Brief and Agile Introduction, Chris Sims and Hillary Louise Johnson. At 54 pages, it’s a great introduction for new Scrum team members and recommended for first time product owners.
Essential Scrum: A Practical Guide to the Most Popular Agile Process, Kenneth S. Rubin. To me, Kenny’s book reads like a text book: official and comprehensive but dry and tough going with few real-world examples.
User Stories Applied: For Agile Software Development, Mike Cohn. The definitive guide to writing user stories as a vehicle for requirements.
Agile Estimating and Planning, Mike Cohn. This is required reading for all the new members in my CRM practice.
The Phoenix Project: A Novel about IT, DevOps, and Helping Your Business Win, Gene Kim. Business novels are extremely rare and this is one of only two business novels I’ve ever read that I recommend.
User Story Mapping: Discover the Whole Story, Build the Right Product, Jeff Patton. A great explanation of why requirements don’t work, and how user story mapping can transform flat backlogs into something much more useful.