| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Cool Tobacco, Sweet Coca: Teachings of an Indian Sage from the Colombian Amazon | 978-0-9527302-1-7 (0-9527302-1-9) | 1990 | |
| This I Believe and Other Essays | 978-1-870098-66-3 (1-870098-66-8) | 1997 | E.F. Schumacher |