1. Preamble to the Constitution of the WHO as adopted by the International Health Conference, New York, June 19–22, 1946, signed on July 22, 1946, by the representatives of 61 States (Official Records of the WHO, No. 2, p. 100) and entered into force on April 7, 1948.
2. Surveillance for determinants of population health;Parrish,2010
3. Historical development;Thacker,2010
4. Natural and political observations made upon the bills of mortality;Graunt,1939
5. The surveillance of communicable diseases of national importance;Langmuir;N Engl J Med,1963