1. Smoking habits of students in secondary health institutes in Riyadh City, Saudi Arabia;Al-Shabry;Journal of the Royal Society of Health,1993
2. Bener, A. (1987) Smoking habits among male students at King Saud University. Journal of the Royal Society of Health, 107(1), 28–30
3. Benjamin, B. (1982) Smoking and Mortality: Biological and Social Aspects of Mortality and the Length of Life, Ordina Editions: Samuel H. Preston, pp. 433–447. Liege, Belgium
4. Vulnerability to psychopathology in nicotine-dependent smokers: An epidemiologic study of young adults;Breslau;American Journal of Psychiatry,1993
5. Dixon, W. J., Brown, B. M., Engelman, L. and Jennrich, R. (1990) BMDP Statistical Software Manual. University of California Press, Berkeley