1. Abraham, M. D., Kaal, H. L., & Cohen, P. D. A. (2002). Licit and illicit drug use in the Netherlands 2001. Amsterdam: CEDRO/Mets en Schilt.
2. ‘Partying’ hard: Party style, motives for and effects of MDMA use at rave parties;Bogt;Substance Use & Misuse,2005
3. Ecstasy use among college undergraduates: Gender, race and sexual identity;Boyd;Journal of Substance Abuse Treatment,2003
4. Cocaine use in Amsterdam in non deviant subcultures;Cohen;Addiction Research,1994
5. Coumans, A. M. (2005). Survival on the fringes of society. Marginalisation of and hardening among chronic heroin users. Rotterdam/Maastricht: Addiction Research Institute/University of Maastricht (dissertation).