@book{3216,
	author = {Mara, David Duncan and World Health Organization},
	title = {Guidelines for the safe use of wastewater and excreta in agriculture and aquaculture : },
	publisher = {WHO,},
	year = {1989.},
	address = {Geneva :},
	url = {https://apps.who.int/iris/bitstream/handle/10665/41681/9241542489.pdf?sequence=1&isAllowed=y}
}