1. M. J. Atha(1982 ) Epidemiological Aspects of Cannabis Use in Britain. [Unpublished extended essay] Department of Psychology, University of Sheffield.
2. M. J. Atha(1985 ) Quantitative assessment of cannabis use patterns amongst regular users, Paper presented to November 1985 meeting of Society for the Study of Addiction, London.
3. J. Ditton, and K. Speirtts(1982 ) The rapid increase of heroin-addiction in Glasgow during 1981 , Mimeo (University of Glasgow, Department of Sociology).
4. Data Note-2. Measuring U.K. Alcohol and Tobacco Consumption