Here are all the references you need to go through if you are planning to self-study for ITIL:

Quick Guides to start with: 

ITIL® Foundation Essentials: The Exam Facts You Need by Claire Agutter  IT Governance © 2012

ITIL® 2011 At a Glance by John O. Long  Springer © 2012

Books to clear your ITIL Concepts:

ITIL® Lifecycle Essentials: Your Essential Guide for the ITIL® Foundation Exam and Beyond by Claire Agutter  IT Governance © 2013

ITIL® For Dummies by Peter Farenden  John Wiley & Sons © 2012

Practice Questions:

ITIL Exam Prep: Questions, Answers & Explanations by Christopher Scordo  SSI Logic © 2013

IT Service Management Foundation Practice Questions: For ITIL® Foundation Exam Candidates, Second Edition by Steve Mann (ed), Tony Gannon and Nigel Mear  BCS © 2012