Cleansing the Doors of Perception: The Religious Significance of Entheogenic Plants and Chemical

The Doors of Perception and Heaven and Hell

The Psychedelic Explorer's Guide: Safe, Therapeutic, and Sacred Journeys

Food of the Gods: The Search for the Original Tree of Knowledge A Radical History of Plants, Drugs, and Human Evolution

Sacred Knowledge: Psychedelics and Religious Experiences

The World's Religions (Plus)

Plants of the Gods: Their Sacred, Healing, and Hallucinogenic Powers

How to Change Your Mind: What the New Science of Psychedelics Teaches Us About Consciousness, Dying, Addiction, Depression, and Transcendence

Tales of Wonder: Adventures Chasing the Divine, an Autobiography

LSD My Problem Child: Reflections on Sacred Drugs, Mysticism and Science

Forgotten Truth: The Common Vision of the World's Religions