1. American Psychiatric Association (APA), 1987. Diagnostic and Statistical Manual of Mental Disorders (Revised 3rd edn). American Psychiatric Association, Washington DC.
2. American Psychiatric Association (APA), 1994. Diagnostic and Statistical Manual of Mental Disorders (4th edn) American Psychiatric Association, Washington DC.
3. Distribution and consequences of near-daily cannabis use;Anthony;American Journal of Epidemiology,1983
4. Comparative epidemiology of dependence on tobacco, alcohol, controlled substances, and inhalants: basic findings from the national comorbidity survey;Anthony;Experimental and Clinical Psychopharmacology,1994
5. Centers for Disease Control and Prevention, 1995. Youth Risk Behavior Surveillance – US, 1993 in CDC Surveillance Summaries, March 24, 1995. MMWR 44 (No. SS-1).