After the Fight: Using Your Disagreements to Build a Stronger Relationship
by Daniel B. Wile

The Seven Principles for Making Marriage Work: A Practical Guide from the Country's Foremost Relationship Expert
by John Gottman PhD

The New Rules of Marriage: What You Need to Know to Make Love Work
by Terrence Real (Author), Marc Cashman (Narrator), Random House Audio (Publisher)

The Enneagram for Relationships: Transform Your Connections with Friends, Family, Colleagues, and in Love
by Ashton Whitmoyer-Ober MA

Taming Your Outer Child: Overcoming Self-Sabotage and Healing from Abandonment
by Susan Anderson