1. Farber, H.K. and McIntosh, R. 1966.History of the American Pediatric Society, 300New York: Blakiston Co.
2. Cockburn, A. 1963.The Evaluation and Eradication of Infectious Diseases, 219–230. Baltimore: The Johns Hopkins Press.
3. Edsall, G. 1962.Efficacy of Immunization Procedures Used in Public Health Practice, WHO Public Health Paper Vol. 8, 51–84.