@book{44006,
	author = {Perman, Roger, and Ma, Yue},
	title = {Natural resource and environmental economics /},
	publisher = {Pearson Addison Wesley,},
	year = {2011.},
	address = {Harlow, Essex ;},
	edition = {Forth edition},
	note = {Prev. ed. entered under author: Perman, Roger, 1949-}
}