References
- Lilienfeld AM: Foundations of Epidemiology. New York, Oxford University Press, 1976, pp 194–195
- Lilienfeld,1 pp 164–165
- Mausner JS, Bahn AK: Epidemiology: An Introductory Text. Philadelphia, WB Saunders Co, 1974, p 142
- MacMahon B, Pugh TF: Epidemiology: Principles and Methods. Boston, Little Brown & Co, 1970, pp 229–232
- Feinstein AR: Clinical Biostatistics. St Louis, CV Mosby Co, 1977, p 79
- Lilienfeld,1 p 214