@book{234782,
	author = {Callan, Scott, and Thomas, Janet M.,},
	title = {Environmental economics & management :},
	publisher = {South-Western Cengage Learning,},
	year = {[2013]},
	address = {Mason, OH, USA :},
	edition = {Edition 6.},
	note = {H.B},
	url = {http://www.loc.gov/catdir/enhancements/fy1307/2012935809-b.html}
}