- Author: Richard Alpert, Sidney Cohen, Lawrence Schiller
- Language: English
- Year: 2023
- Author: Ram Dass, Richard Alpert, Ralph Metzner
- Language: English
- Year: 2010
- Author: Alan Watts Daniel Pinchbeck Timothy Leary Richard Alpert Ph.D
- Language: English
- Year: 2013
- Author: Timothy Leary Richard Alpert Ralph Metzner
- Language: Spanish
- Year: 1978
- Author: Timothy Francis Leary Ralph Metzner Richard Alpert
- Language: English
- Year: 2000
- Author: Alan W. Watts Timothy Leary Richard Alpert
- Language: English
- Year: 1965
- Author: Timothy Francis Leary Ralph Metzner Richard Alpert
- Language: English
- Year: 2000
- Author: Timothy Francis Leary Ralph Metzner Richard Alpert
- Language: English
- Year: 1964