Practical Scrum: A User's Guide
Heath Herel
Lean Manufacturing: A Plant Floor Guide
John Allen & Charles Robinson & David Stewart
How to Write a Business Plan
WikiJob
Scrum and XP from the Trenches How We Do Scrum - 2nd. Edition
Henrik Kniberg
PMI-RMP (Risk Management Professional)
Carl Pritchard
The Scrum Guide
Ken Schwaber
Scrum Basics