@book{223754,
	author = {Eaton, Andrew D. and Clesceri, Lenore S.},
	title = {Standar methods : for the examination of water & wastewater / Andrew D. Eaton ...[et al.]},
	publisher = {American Public Health Association},
	year = {2005},
	address = {Washington},
	edition = {21a ed.}
}