APA (7th ed.) Zitazioa

Koch, P. (2010). Water sources (4th ed.). American Water Works Association.

Chicago Style (17th ed.) Zitazioa

Koch, Paul. Water Sources. 4th ed. Denver, Colo.: American Water Works Association, 2010.

MLA (9th ed.) Zitazioa

Koch, Paul. Water Sources. 4th ed. American Water Works Association, 2010.