1. Robins LN, Regier DA. Psychiatric Disorders in America: the Epidemiologic Catchment Area Study (New York, The Free Press), 1991.
2. Kessler RC, McGonach KA, Zhao S. Lifetime and 12-month prevalence of DSM-III-R psychiatric disorders in the United States.Arch Gen Psychiat 1994; 51: 8–19.
3. World Health Organisation. The ICD-10 Classification of Mental and Behavioral Disorders-diagnostic criteria for research (Geneva, World Health Organisation) 1996.
4. Anthony JC, Wa rner LA, Kessler RC. Comparative epidemiology of dependence on tobacco, alcohol, controlled substance and inhalants: basic findings from the National Comacology survey.Clin Expl Pharmacol 1994; 2: 244–68.
5. Agahi C, Spencer CP. “Drug abuse in pre- Revolutionary Iran”J Psychoactive Drugs 1981; 13: 39–46.