1. Home Affairs Select Committee: The Government's Drugs Policy: Is It Working? Third Report. 2000
http://www.publications.parliament.uk/pa/cm200102/cmselect/cmhaff/318/31802.htm
London: The Stationary Office, Accessed 04/04/2008
2. Blanchard S: How cannabis was criminalized. 2007, London: Independent Drug Monitouring Unit, Accessed 04/01/2008,
http://www.idmu.co.uk/historical.htm
3. Department of Health: Drug misuse and dependence – guidelines on clinical management. 1999, London: The Stationary Office
4. Regier DA, Farmer ME, Rae DS, Locke BZ, Keith SJ, Judd LL, Goodwin FK: Comorbidity of mental disorders with alcohol and other drug abuse: results from the Epidemiological Catchment Area (ECA) study. Journal of the American Psychiatric Association. 1990, 264: 2511-2518.
5. Brooner RK, King VL, Kidorf M, Schmidt CW, Bigelow GE: Psychiatric and substance use comorbidity among treatment-seeking opioid abusers. Archives of General Psychiatry. 1997, 54 (1): 71-80.