APA (7th ed.) Zitazioa
World Health Organization, UNICEF, & ebrary, Inc. (2010). Progress on sanitation and drinking water: 2010 update. World Health Organization.
Chicago Style (17th ed.) Zitazioa
World Health Organization, UNICEF, eta Inc ebrary. Progress on Sanitation and Drinking Water: 2010 Update. Geneva: World Health Organization, 2010.
MLA (9th ed.) Zitazioa
World Health Organization, et al. Progress on Sanitation and Drinking Water: 2010 Update. World Health Organization, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.