
- Author: Richard Evans Schultes Albert Hofmann
- Language: French

- Author: Richard Evans Schultes Albert Hofmann Christian Ratsch
- Language: English
- Year: 2001

- Author: Richard Evans Schultes Albert Hofmann Christian Rätsch
- Language: English
- Year: 2001

- Author: Richard Evans Schultes Albert Hofmann Christian Rätsch
- Language: English
- Year: 1998