Friendships
Whether your friendships seem great or if you are having problems, the books by friendship expert, Jan Yager, Ph.D., will improve your relationships or help you understand why some friendships went bad. Her books include:

Friendshifts: The Power of Friendship and How it Shapes Our Lives

When Friendship Hurts: How to Deal with Friends Who Betray, Abandon, or Wound You
Her websites will also be useful, and you can order her books through these links:
http://www.whenfriendshiphurts.com
http://www.janyager.com/friendship
http://www.janyager.com
http://www.janyager.com/writing

I will add new categories on this page as I get time!