@book{3256,
	author = {Franceys, R and World Health Organization},
	title = {A guide to the development of on-site sanitation / },
	publisher = {WHO,},
	year = {1992.},
	address = {Geneva :},
	url = {https://apps.who.int/iris/bitstream/handle/10665/39313/9241544430_eng.pdf?sequence=1&isAllowed=y}
}