@book{27045,
	author = {Zenz, Gary Joseph. and Westing, J. Howard},
	title = {Purchasing and the management of materials /},
	publisher = {Wiley,},
	year = {c1981.},
	address = {New York :},
	edition = {5th ed.},
	note = {Fourth ed., by J. H. Westing, I. V. Fine, and G. J. Zenz, published under title: Purchasing management.}
}