Gaya APA

Mara, D., Cairncross, S. (1989). Guidelines for the Safe Use of Wastewater and Excreta in Agriculture and Aquaculture : Measures for Public Health Protection . Geneva: World Health Organization.

Gaya MLA

Mara, Duncan., Cairncross, Sandy. "Guidelines for the Safe Use of Wastewater and Excreta in Agriculture and Aquaculture : Measures for Public Health Protection". Geneva: World Health Organization, 1989. print.