| title | ISBN-13 (ISBN-10) | year of publica- tion | |
|---|---|---|---|
| Charakterkunde der vier Temperamente | 978-3-7787-9118-9 (3-7787-9118-4) | 2003 | |
| The Four Temperaments: A Rediscovery of the Ancient Way of Understanding Health and Character | 978-1-56924-562-0 (1-56924-562-2) | 2002 |