Koch, P. (2010). Water sources (4th ed.). American Water Works Association.
Citazione stile Chigago Style (17a edizione)Koch, Paul. Water Sources. 4th ed. Denver, Colo.: American Water Works Association, 2010.
Citatione MLA (9a ed.)Koch, Paul. Water Sources. 4th ed. American Water Works Association, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.