1. Porter D. Health, Civilization, and the State: A History of Public Health from Ancient to Modern Times. London: Routledge, 1999, p. 384.
2. Tomes N. The Gospel of Germs: Men, Women, and the Microbe in American Life. Cambridge, MA: Harvard University Press, 1999, p. 368.
3. Burnet FM. Natural History of Infectious Disease, 2nd edn. New York: Cambridge University Press, 1953, p. 356.
4. Weisz G. Chronic Disease in the Twentieth Century: A History. Baltimore, MD: Johns Hopkins University Press, 2014, p. 328.