@book{9472,
	author = {Isom, Billy G.},
	title = {Rationale for sampling and interpretation of ecological data in the assessment of freshwater ecosystems /},
	publisher = {Astm Intl,},
	year = {1986.},
	series = {Astm special technical publication// stp.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0803104553/chopaconline-20}
}