They are not grouped in any category, and the order is quite random, although I will try to have a library in here.
Self-development
The Power of a Positive No: How to Say No and Still Get to Yes
The Power of Full Engagement: Managing Energy, Not Time, Is the Key to High Performance and Personal Renewal
The Way We're Working Isn't Working: The Four Forgotten Needs That Energize Great Performance
Abolishing Performance Appraisals: Why They Backfire and What to Do Instead
PMP certification books
PMP Exam Prep, Sixth Edition: Rita's Course in a Book for Passing the PMP Exam - Rita Mulcahy
A Guide to the Project Management Body of Knowledge: (Pmbok Guide)
Project Management: A Systems Approach to Planning, Scheduling, and Controlling - Harold Kerzner
The PMP Exam: How to Pass on Your First Try, Fourth Edition
PMP Project Management Professional Exam Study Guide, Includes Audio CD