(2012). Progress on drinking water and sanitation. UNICEF and World Health Organization.
Citazione stile Chigago Style (17a edizione)Progress on Drinking Water and Sanitation. New York: UNICEF and World Health Organization, 2012.
Citatione MLA (8a ed.)Progress on Drinking Water and Sanitation. UNICEF and World Health Organization, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.