Here are some of the best books:
The Anxiety and Phobia Workbook by Edmund J.Bourne
This is a complete book that explains in detail the cause and nature of anxiety disorders and describes the different treatments available. It goes in depth on the treatments and how they work so you can choose the best. I is also very interactive because has exercises that helps you recover either on your own or with a professional.
Another interesting books is:
Living Fully with Shyness and Social Anxiety: A Comprehensive Guide to Gaining Social Confidence by Erika B. Hilliard
This book is written by a person that has experience in treating different social anxiety support groups, she was shy herself. With in the book you will be given an action plan to overcome this fear and have a fulfilling life.
There are other interesting books that you might want to look out like:
-Dying of Embarrassment: Help for social anxiety and phobia
-Diagonally-Parked in a Parallel Universe: Working Through Social Anxiety
-coming Shyness and Social Phobia: A Step-by-step Guide
Those are some of the most popular books at Amazon.com and you can find many more, you should choose whatever you feel meets your necessities of you problem, doing some exercise can help you a lot with this disorder.
If you want more tips and information on this social disorder you can search wikipedia.org for more in depth articles or even go to youtube.com where you can find videos of people that have social anxiety and how they are overcoming their problem. Some of those videos are testimonials of their problem.