U.S. Environmental Protection Agency. Enhanced coagulation and enhanced precipitative softening guidance manual.
Chicago-referens (17:e uppl.)U.S. Environmental Protection Agency. Enhanced Coagulation and Enhanced Precipitative Softening Guidance Manual.
MLA-referens (9:e uppl.)U.S. Environmental Protection Agency. Enhanced Coagulation and Enhanced Precipitative Softening Guidance Manual.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.