1. Alleyne, B., C., Stuart, P. and Copes, R. (1991) ‘Alcohol and Other Drug Use in Occupational Fatalities’, Journal of Occupational Medicine, 33, 496–500.
2. Axel, H., (1989) ‘Characteristics of Firms with Drugs Testing Programs’, in Drugs in the Workplace: Research and Evaluation Data, NIDA Research Monograph, No. 91 (Washington, DC: US Government Printing Office).
3. Backer, T., E. (1987) Strategic Planning for Workplace Drug Abuse Programs (DHHS Publication No. ADM-87-1538) (Rockville, MD: National Institute on Drug Abuse).
4. Baumrin, B., H. (1990) ‘To Test or Not to Test? Social Welfare versus Worker Freedom’, Journal of Psychoactive Drugs, 22(4), 485–7.
5. Becker, G., S. (1968) ‘Crime and Punishment: an Economic Approach’, Journal of Political Economy, 76(2), 169–217.