Don Richard Riso

Understanding the Enneagram - Russ Hudson

Enneagram Transformations - Don Richard Riso

Discovering Your Personality Type: The Essential Introduction to the Enneagram - Don Richard Riso

Personality Types: Using the Enneagram for Self-Discovery - Don Richard Riso

The Wisdom of the Enneagram: The Complete Guide to Psychological and Spiritual Growth for the Nine Personality Types - Don Richard Riso