Check them out on Amazon.com for reviews and further information:
Buried In Treasures: Help for Compulsive Acquiring, Saving and Hoarding
by David F. Tolin, Ph.D., Randy O. Frost, Ph.D.
Oxford University Press, 2007
Compulsive Hoarding and Acquiring: Workbook
Compulsive Hoarding and Acquiring: Therapist Guide
by Gail Steketee, Ph.D. and Randy Frost, Ph.D.
Oxford University Press, 2006
Overcoming Compulsive Hoarding: Why You Save and How You Can Stop
by Fugen Neziroglu, Ph.D., Jerome Bubrick, Ph.D. and Jose Yaryura-Tobias, M.D.
New Harbinger Publications, July 2004