@book{2920,
	author = {World Health Organization},
	title = {Progress on Drinking Water and Sanitation - 2014 update},
	publisher = {WHO,},
	year = {2014.},
	address = {Geneva :},
	url = {https://apps.who.int/iris/bitstream/handle/10665/112727/9789241507240_eng.pdf?sequence=1&isAllowed=y}
}