References
- Klär I. I. Drogenkarrieren in lebenslaufanalyrischer Perspektive. Max Planck Institute for International Penal Law, Freiburg iBr 1995, [Curriculum Analysis of Drug Careers]
- Knolle H. Incidence and prevalence of illegal drug use in Switzerland in the 1980s and early 1990s: An analytical study. Substance Use Misuse 1997; 32: 1349–1368
- Office fédéral De La Police. 1977–97, 13, Berne: Statistique Suisse des Stupéfiants
- Office fédéral De La Police. 1977–97, 13, Berne: Annuaire Statistique de la Suisse.