1. Berkson J. Limitations of the application of fourfold table analysis to hospital data. Biometrics Bulletin 1946;2: 47-53.
2. Corbett SJ, Rubin GL, Curry GK, Kleinbaum DG. The health effects of swimming at Sydney Beaches. The Sydney Beach Users Study Advisory Group. Am J Public Health. 1993;83(12): 1701-6.
3. Greenberg RS, Daniels SR, Flanders WD, Eley JW, Boring JR. Medical Epidemiology (3rd Ed). Lange Medical Books, New York, 2001.
4. Hill H, Kleinbaum DG. Bias in Observational Studies. In Encyclopedia of Biostatistics, pp 323-329, Oxford University Press, 1999.
5. Horwitz RI, Feinstein AR. Alternative analytic methods for case-control studies of estrogens and endometrial cancer. N Engl J Med 1978;299(20):1089-94.