1. The disease and adaptive models of addiction: A framework for evaluation;Alexander,1988
2. Beyound Vancouver's “Four Pillars;Alexander;International Journal of Drug Policy,2006
3. The pursuit of oblivion—A global history of narcotics;Davenport-Hines,2002
4. ECAD Newsletter. (1999–2008). A bimonthly published by the Sweden based organisation European Cities Against Drugs (ECAD). No. 35-115. Can be partially retrieved at http://www.www.ecad.net.
5. Ege, P. (1997). Harm Reduction–hvad ligger vi i det? (What is harm reduction?—quote translated from Danish by author). STOF 2, 10–12. Copenhagen: Narkotikaraadet.