| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2007 | 978-0-9793847-0-7 | Roxanne Howe-Murphy | Deep Coaching: Using the Enneagram as a Catalyst for Profound Change |
| 2013 | 978-0-9793847-1-4 | Roxanne Howe-Murphy | Deep Living: Transforming Your Relationship to Everything That Matters Through the Enneagram |