Gaya APA

Williamson, H, T, M, D. (1976). Water treatment and sanitation : a handbook of simple methods for rural areas in developing countries . : Intermediate Technology Publications.

Gaya MLA

Williamson, H., T., Mann,, D.. "Water treatment and sanitation : a handbook of simple methods for rural areas in developing countries". : Intermediate Technology Publications, 1976. Lawas.