| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Know Your Parenting Personality: How to Use the Enneagram to Become the Best Parent You Can Be | 978-0-471-25061-6 (0-471-25061-9) | 2003 |
| The Enneagram Intelligences: Understanding Personality for Effective Teaching and Learning | 978-0-89789-562-0 (0-89789-562-2) | 1999 |