@book{67404,
	author = {Kolstad, Charles D.},
	title = {Environmental economics /},
	publisher = {Oxford University Press,},
	year = {2011.},
	address = {New York :},
	edition = {Int. ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1009/2009053921-t.html}
}