| #2 |  The enneagram
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| #3 |  Millenneagram
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| #4 |  The Spiritual Dimension of the Enneagram The Spiritual Dimension of the Enneagram: Nine Faces of the Soul
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| #5 |  The Enneagram Unveiled The Enneagram Unveiled: A Christian & Metaphysical Perspective
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| #6 |  The Geography of the Soul: The Enneagram in Christian Perspective
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| #7 |  Becoming Us
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| #8 |  Spiritual Rhythms for the Enneagram: A Handbook for Harmony and Transformation
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| #9 |  The Sacred Enneagram
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| #10 |  The Complete Enneagram
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| #11 |  The Wisdom of the Enneagram
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| #12 |  Experiencing the Enneagram Experiencing the Enneagram
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| #13 |  Enneagram 2 Enneagram 2: Advancing Spiritual Discernment
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| #14 |  The Enneagram & Grace
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| #15 |  Enneagram: The Discernment of Spirits
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| #16 |  Discovering The Enneagram Discovering The Enneagram: An Ancient Tool a New Spiritual Journey
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| #17 | Rumi's Original Sufi Enneagram Rumi's Original Sufi Enneagram
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| #18 | Sex, Love and Your Personality Sex, Love and Your Personality: The Nine Faces of Intimacy
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| #19 |  The Sufi Enneagram: The Secrets of the Symbol Unveiled
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| #20 |  Personality Types
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| #21 | Parables and the Enneagram Parables and the Enneagram
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| #22 | Merton Merton: An Enneagram Profile
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| #23 |  The Intelligent Enneagram
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