World Health Organization World Plumbing Council. (2006). Health aspects of plumbing. World health Organization.
Cita Chicago Style (17a ed.)World Health Organization World Plumbing Council. Health Aspects of Plumbing. Geneva: World health Organization, 2006.
Cita MLA (8a ed.)World Health Organization World Plumbing Council. Health Aspects of Plumbing. World health Organization, 2006.
Precaución: Estas citas no son 100% exactas.