Gaya APA

Curds, C., H.A., I, H. (1987). Ecological Aspects of used-water treatment volume 2 biological activities ìand treatment processes . London: .

Gaya MLA

Curds, C.R.., H.A., I., Hawkes,. "Ecological Aspects of used-water treatment volume 2 biological activities ìand treatment processes". London: , 1987. .