The following are books that I recommend for clients to supplement therapy:

The Anxiety and Phobia Workbook - 5th Edition - I have used this book to help people with all forms of anxiety with a high rate of success!

The 5 Love Languages - The Secret to Love That Lasts  A necessary tool to understanding what you and your partner need to be successful and happy in your relationship.  This book enhances couples therapy and increases probability of success.