@book{52239,
	author = {Crabbé, Ann and Leroy, Pieter},
	title = {The handbook of environmental policy evaluation /},
	publisher = {Earthscan,},
	year = {2008},
	address = {London ;},
	url = {http://www.loc.gov/catdir/toc/fy0903/2008018437.html}
}