1. Bean, P. T. (1974) The Social Control of Drugs (London: Mart in Robertson).
2. Bean, P. T. (1990) ‘Use and supply of crack/cocaine in Nottingham’, Report to the Home Office Research and Planning Unit.
3. Gossop, M. (1987) ‘Beware Cocaine’, British Medical Journal, Vol. 295, 17 October, p. 945.
4. HMSO (1989) Crack: The threat of hard drugs in the next decade Home Affairs Committee (Interim report), House of Commons 19 July.
5. Inciardi, J. (1988) ‘Beyond cocaine; basuco, crack and other coca products’, Contemporary Drug Problems, Vol. 14, no. 3, pp. 461–92.