| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Path Between Us: An Enneagram Journey to Healthy Relationships | 978-0-8308-4642-9 (0-8308-4642-5) | 2018 | |
| The Road Back to You: An Enneagram Journey to Self-Discovery | 978-0-8308-4619-1 (0-8308-4619-0) | 2016 | Ian Morgan Cron |
| The Road Back to You Study Guide | 978-0-8308-4620-7 (0-8308-4620-4) | 2016 | " |