Biblio

WHO -Geneva, CH, World Health Organization and Institute of Water and Sanitation Development -Harare, ZW, IWSD, “Cholera and other epidemic diarrhoeal diseases control : technical cards on environmental sanitation”. Geneva, Switzerland, p. 46 p. (PDF file: 2.31 MB) : ill., 1997.

WHO -Geneva, CH, World Health Organization, Guidelines for drinking-water quality. Vol. 3. Surveillance and control of community supplies, 2nd ed.nd ed. Geneva, Switzerland: World Health Organization (WHO), 1997, p. xii, 238 p. : fig., tab.

WHO -Geneva, CH, World Health Organization, Surveillance of drinking-water quality, vol. no. 63. Geneva, Switzerland: World Health Organization (WHO), 1976, p. 135 p.: 16 fig., 9 tab.