| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Bringing Out the Best in Everyone You Coach: Use the Enneagram System for Exceptional Results | 978-0-07-163707-7 (0-07-163707-9) | 2009 | |
| Bringing Out the Best in Yourself at Work: How to Use the Enneagram System for Success | 978-0-07-143960-2 (0-07-143960-9) | 2004 | Ginger Lapid-Bogda |
| What Type of Leader Are You? Using the Enneagram System to Identify and Grow Your Leadership Strengths and Achieve Maximum Success | 978-0-07-147719-2 (0-07-147719-5) | 2007 | |