1. Substance Abuse and Mental Health Services Administration: Overview of Findings from the 2003 National Survey on Drug Use and Health. Office of Applied Studies. NSDUH Series H-24, Publ No SMA 04-3963. Rockville, DHHS, 2004.
2. Adlaf EM, Begin P, Sawka E (eds): Canadian Addiction Survey (CAS): A national survey of Canadians? use of alcohol and other drugs. Prevalence of use and related harms: detailed report. Ottawa, Canadian Centre on Substance Abuse, 2005.
3. Australian Institute of Health and Welfare: 2001 National Drug Strategy Household Survey: First results. AIHW Cat No PHE 35. Drug Statistics Series No 9. Canberra, Australian Institute of Health and Welfare, 2002.
4. Sharp Increase in Illicit Drug Use in Greece: Trends from a General Population Survey on Licit and Illicit Drug Use
5. European Monitoring Centre for Drugs and Drug Addiction: General population surveys of drug use. Statistical bulletin 2005. Available at: http://stats05.emcdda.europa.eu/download/gps14.xls. Accessed: June 2006.