Gaya APA

Davis, M, L. (1976). Water and Wastewater Engineering Design Principles and Practice 1 & 2 . Michigan: Mc Graw-hill Book Comp..

Gaya MLA

Davis, Mackenzie, L. "Water and Wastewater Engineering Design Principles and Practice 1 & 2". Michigan: Mc Graw-hill Book Comp., 1976. Text.