| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Core data for epidemiological studies of nonmedical drug use | 978-92-4-170056-6 (92-4-170056-4) | 1980 | P.H. Hughes · U. Khant · J. Venulet |
| Drug use among non-student youth | 978-92-4-170060-3 (92-4-170060-2) | 1981 | A. Arif · P.H. Hughes |