| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Green Psychology: Transforming our Relationship to the Earth | 978-0-89281-798-6 | 1999 | Ralph, Ph.D. Metzner |
| Sacred Vine of Spirits: Ayahuasca | 978-1-59477-053-1 | 2005 | |
| Searching for the Philosophers' Stone: Encounters with Mystics, Scientists, and Healers | 978-1-62055-776-1 | 2019 | |
| The Ayahuasca Experience: A Sourcebook on the Sacred Vine of Spirits | 978-1-62055-262-9 | 2014 | |
M.D · M P · Ph.D. · R.D. · R. M. · R. Metzner · R. P. · R.Ph. · Ralph D. · Ralph M. · Ralph Metzner