1. Armitage P, Berry G. Statistical Methods in Medical Research, 2nd ed. Oxford: Blackwell Scientific Publications, 1987.
2. Colton T. Statistics in Medicine. Boston: Little, Brown, 1974.
3. Swinscow TDV. Statistics at Square One. London: British Medical Association, 1976.
4. Ingelfinger JA, Mosteller F, Thibodeau LA, Ware JH. Biostatistics in Clinical Medicine. New York: Macmillan, 1983.
5. Kramer MS. Clinical Epidemiology and Biostatistics. Heidelberg: Springer-Verlag, 1988.