(1981). Water And Wastewater Engineering Systems D. Barnes [et Al.]. Pitman.
Lua i Stíl Chicago (17ú heag.)Water And Wastewater Engineering Systems D. Barnes [et Al.]. Pitman, 1981.
Lua MLA (8ú heag.)Water And Wastewater Engineering Systems D. Barnes [et Al.]. Pitman, 1981.
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