| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| L-Tryptophan, Current Prospects in Medicine and Drug Safety | 978-3-11-013673-9 (3-11-013673-2) | 1994 | Hans Steinhart | |
| Tryptophan, Serotonin and Melatonin: Basic Aspects and Applications | 978-0-306-46204-7 (0-306-46204-4) | 1999 | Gerald Huether · Thomas J. Simat · Hans Steinhart |