Couples 

Blog with common issues couples face: www.symbisassessment.com/blog/

Individuals

Boundaries, by Dr. Henry Cloud and Dr. John Townsend

Every Women's Battle, by Shannon Ethridge

Every Man's Battle, by Stephen Arterburn

Changes that Heal, by Dr. Henry Cloud

Parenting

Systematic Tools for Effective Parenting, by Dinkmeyer, McKay, and Dinkmeyer