1. Barnard, M., & Forsyth, A. J. M. (1999). Contrasting levels of adolescent drug use between adjacent urban and rural communities in Scotland. Addiction, 94(11), 1707–1718.
2. Berridge, V., & Edwards, G. (1987). Opium and the people. New Haven: Yale University Press.
3. Brown, R. (2004). Heroin dependence. Wisconsin Medical Journal, 103(4), 20–26.
4. Cohen, P. D. A. (1989). Cocaine use in Amsterdam in non-deviant subcultures. Amsterdam: University of Amsterdam.
5. Dean, A. (1990). Culture and community: Drink and soft drugs in the hebridean youth culture. The Sociological Review, 38(2), 517–563.