REFERENCES
- Commission of Inquiry into the Non-Medical Use of Drugs . 1970 . Interim Report. Ottawa : Information Canada. .
- International Narcotics Control Board . 1987 . Report 1987. New York : United Nations. .
- NIDA . 1986 . Community Epidemiology Work Group Proceedings. Rockville , Maryland : NIDA. .
- Smith , D. E. , Wesson , D. R. , Zerkin , E. L. and Novey , J. H. Substance Abuse in the Workplace. San Francisco : Haight-Ashbury Publications. .
- Weil , A. T. 1972 . The Natural Mind. Boston : Houghton-Mifflin. .
- Whitaker , B. 1987 . The Global Connection. London : Jonathan Cape. .