Here are my top 10 recommended text for PMP studies:
1. A Guide to The Project Management Body of Knowledge (Third Edition)
2. Q & As for the PMBOK Guide (Third Edition)
3. PMP Exam Prep (Fifth Edition) by Rita Mulcahy
4. PMP Project Management Professional Study Guide (Second Edition) by Joseph Phillips
5. Preparing For the Project Management Professional (PMP) Certification Exam by
Michael W. Newell
6. PMP: Project Management Professional Study Guide (Third Edition) by Kim Heldman
7. Field Guide to Project Management (Second Edition) by David I. Cleland
8. Project Management - A Systems Approach To Planning, Scheduling, And Controlling
(Ninth Edition) by Harold Kerzner
9. Project Planning, Scheduling and Control (Fourth Edition) by James P. Lewis
10. The Handbook of Project-Based Management (Second Edition) by J Rodney Turner
Cheers,
Anthony