The Scrum Guide
Ken Schwaber
People Over Process: Leadership for Agility
Michael K Levine
Project Management 2.0: Leveraging Tools, Distributed Collaboration, ...
Harold Kerzner
Practices for Scaling Lean & Agile Development
Craig Larman & Bas Vodde
The agile PMO
Michael Nir
Growing Agile: A Coach's Guide to Training Scrum
Samantha Laing & Karen Greaves & Melissa Fagan & Ron Jeffries & Sharon Bowman