Metamorphous Press · Public Citizen Group
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Enneagram Applications | 978-1-55552-103-5 (1-55552-103-7) | 2001 | Clarence Thomson |
| Enneagram Movie and Video Guide: How To See Personality Types In The Movies, 2nd Edition | 978-1-55552-100-4 (1-55552-100-2) | 1999 | |
| Natural Self Confidence | 978-99917-962-1-5 (99917-962-1-5) | 1984 | Carol Erickson |