World Health Organization World Plumbing Council. (2006). Health aspects of plumbing. World health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization World Plumbing Council. Health Aspects of Plumbing. Geneva: World health Organization, 2006.
Citatione MLA (8a ed.)World Health Organization World Plumbing Council. Health Aspects of Plumbing. World health Organization, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.