HarperCollins · Mind Garden, Inc.
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Stanford Enneagram Discovery Inventory and Guide | 978-0-9666601-0-4 (0-9666601-0-2) | 1997 | Virginia A. Price |
| The Essential Enneagram: The Definitive Personality Test and Self-Discovery Guide | 978-0-06-251676-3 (0-06-251676-0) | 2000 | " |
D D · D. Daniels · David D. · David Daniels · David N., M.D. Daniels · n.d.