- Sex and the Enneagram: A Guide to Passionate Relationships for the 9 Personality Types
- Better Parenting with the Enneagram: Nine Types of Children and Nine Types of Parents
- The Enneagram of Eating: How the 9 Personality Types Influence Your Food, Diet, and Exercise Choices
- The Girl Who Bites Her Nails and the Man Who Is Always Late: What Our Habits Reveal About Us
- Healing Habits: The A-Z guide to the underlying emotional causes of common habits.