@book{90511,
	author = {Helfand, Gloria E. and ebrary, Inc.},
	title = {Environmental policy analysis for decision making},
	publisher = {Kluwer Academic Publishers,},
	year = {c2001.},
	series = {The economics of non-market goods and resources ;},
	address = {Dordrecht ;},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10067231}
}