| title | ISBN-13 | year of publica- tion | |
|---|---|---|---|
| Thanatos to Eros. Thirty-five Years of Psychedelic Exploration | 978-3-86135-453-6 | 1994 | |
| The Secret Chief: Conversations with a Pioneer of the Underground Psychedelic Therapy Movement | 978-0-9660019-0-7 | 1997 | |
| The Secret Chief: Conversations With a Pioneer ofthe Underground Psychedelic Therapy Movement | 978-0-9660019-1-4 | 1997 | |
| The Secret Chief Revealed | 978-0-9660019-6-9 | 2005 |