Finding Freedom: Undersanding Our Relationships Using Object Relations & the Enneagram, by Belinda Gore, Ph. D., 2023
Deep Living: Transforming Your Relationship to Everything That Matters through the Enneagram, by Roxanne Howe-Murphy, 2013
Personality Types: Using the Enneagram for Self-Discovery, by Don Riso and Russ Hudson, 1996
The Wisdom of the Enneagram: The Complete Guide to Psychological and Spiritual Growth for the Nine Personality Types, by Don Riso and Russ Hudson, 1999
Understanding the Enneagram: The Practical Guide to Personality Types, by Don Riso and Russ Hudson, 2000
The Essential Enneagram: The Definitive Personality Test and Self-Discovery Guide, by David Daniels, and Virginia Price, 2009
The Enneagram Institute: www.enneagraminstitute.com
Deep Coaching Institute, www.deepcoachinginstitute.com
The Center For Compassion And Altruism Research And Education, ccare.stanford.edu/education/applied-compassion-training/