For information on PRINCE2 project management methods and related qualifications.
A useful overview of all aspects of project management:
Nokes, S and Kelly, S (2nd Ed, 2007) “The Definitive Guide to Project Management”, FT Prentice Hall
An insightful guide to the people management skills needed for project management:
Newton, R (2005) “The Project Manager: mastering the art of delivery”, FT Prentice Hall