@book{2063,
	author = {Perman, Roger, and Ma, Yue.},
	title = {Natural resource and environmental economics /},
	publisher = {Pearson Education,},
	year = {2003.},
	address = {New York :},
	edition = {Third edition.},
	note = {Rev. ed. of: Natural resource and environmental economics / Roger Perman, Yue Ma, James McGilvray. 1996.}
}