Agile Retrospectives: Making Good Teams Great (Pragmatic Programmers)
Agile Estimating and Planning (Robert C. Martin Series)
Essential Scrum: A Practical Guide to the Most Popular Agile Process (Addison-Wesley Signature Series (Cohn))
Scrum Mastery
User Stories Applied: For Agile Software Development (Addison-Wesley Signature Series (Beck))
Succeeding with Agile: Software Development Using Scrum (Addison-Wesley Signature Series (Cohn))
User Story Mapping: Discover the Whole Story, Build the Right Product
Management 3.0: Leading Agile Developers, Developing Agile Leaders (Addison-Wesley Signature Series (Cohn))