For individuals:

Man's Search for Meaning by Viktor E. Frankl 
The Eight Concepts of Bowen Theory by Roberta Gilbert, M.D.
One Family's Story: A Primer on Bowen Theory by Michael E. Kerr, M.D.
You Can Go Home Again: Reconnecting with your Family by Monica McGoldrick
Family Constellation: Its Effects on Personality and Social Behavior by Walter Toman
The Resilient Self: How Survivors of Troubled Families Rise above Adversity by Steven J. Wolin, M.D. & Sybil Wolin, Ph.D. 

For couples:

Extraordinary Relationships: A New Way of Thinking about Human Interactions by Roberta Gilbert, M.D.
The Dance of Anger by Harriet Goldhor Lerner, Ph.D.
The Dance of Intimacy by Harriet Goldhor Lerner, Ph.D.
The Lost Art of Listening: How Learning to Listen Can Improve Relationships by Michael P. Nichols
Passionate Marriage by David Schnarch, Ph.D.

For parents/families:

Children: The Challenge by Rudolf Dreikers and Vicki Soltz
Friedman's Fables by Edwin H. Friedman
Connecting with our Children: Guiding Principles for Parents in a Troubled World by Roberta M. Gilbert, M.D.
Raising an Emotionally Intelligent Child by John Gottman, Joan Declaire, and Daniel Goleman