@book{19460,
	author = {American Public Health Association and American Water Works Association.},
	title = {Standard methods for the examination of water and waste water},
	publisher = {American Public Health Association,},
	year = {1981},
	address = {Washington :},
	edition = {15 ed,.},
	note = {Sup. Selected analytical methods approved and cited by the United States Environmental Protection Agency (s.l.) 1981. 106 p.}
}