TSO
Part of the Office of Government Commerce (Great Britain)
Agile Project and Service Management: Delivering IT services using ITIL®, PRINCE2® and DSDM® 2nd Ed.
ITIL® V3 Foundation Handbook: Pocketbook from the Official Publisher of ITIL
Introduction to ITIL®: The Key to Managing IT Services
Managing Successful Programmes: Best Management Practice 4th Ed.