1. Beckley Foundation. (2009). The Beckley Foundation Global Cannabis Commission Report. Accessed on line September 06, 2009, at: http://www.beckleyfoundation.org/policy/cannabis_commission.html.
2. Chilling out: The cultural politics of substance consumption, youth and drug policy;Blackman,2004
3. A brighter side: Protective and risk factors in the rehabilitation of chronic drug abusers in Hong Kong;Cheung,2009
4. Drugs and youth cultures: Is Australia experiencing the normalisation of adolescent drug use;Duff;Youth & Society,2003
5. Alcohol and other drug use among students in 30 European countries;ESPAD,2001