@book{2921,
	author = {World Health Organization. },
	title = {Guidelines for drinking-water quality},
	publisher = {WHO,},
	year = {1998.},
	address = {Geneva :},
	edition = {Second edition.},
	url = {https://apps.who.int/iris/bitstream/handle/10665/42852/9241546387.pdf?sequence=1&isAllowed=y}
}