(1981). Drinking-water and sanitation: 1981-1990 : a way to health.
Cita Chicago Style (17a ed.)Drinking-water and Sanitation: 1981-1990 : A Way to Health. 1981.
Cita MLA (8a ed.)Drinking-water and Sanitation: 1981-1990 : A Way to Health. 1981.
Precaución: Estas citas no son 100% exactas.