Ralph Metzner
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- DMT: The Spirit Molecule (2010)
- Salvia Divinorum: A Western Approach (2022)
- Peyote to LSD: A Psychedelic Odyssey (2008)
- LSD: Problem Child and Wonder Drug (2009)
- The Way of the Psychonaut (2020)
- Hofmann's Potion: The Pioneers of LSD (2002)
- The Psychedelic Experience (1965)
- Neurons to Nirvana (2013)
- Entheogen: Awakening the Divine Within (2006)
- How To Go Out of Your Mind: The LSD Crisis (1966)
- Signs Out of Time: The Life of Archaeologist Marija Gimbutas (2004)
- Turn On, Tune In, Drop Out (1967)