APA (7th ed.) Zitazioa
(2011). Guidelines for drinking-water quality (4th ed.). WHO.
Chicago Style (17th ed.) Zitazioa
Guidelines for Drinking-water Quality. 4th ed. Geneva: WHO, 2011.
MLA (9th ed.) Zitazioa
Guidelines for Drinking-water Quality. 4th ed. WHO, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.