Koch, P. (2010). Water sources (4th ed.). American Water Works Association.
Chicago-čujuhus (17. p.)Koch, Paul. Water Sources. 4th ed. Denver, Colo.: American Water Works Association, 2010.
MLA-čujuhus (9. p.)Koch, Paul. Water Sources. 4th ed. American Water Works Association, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.