@book{88,
	author = {Leenders, Michiel R.},
	title = {Purchasing and supply management :},
	publisher = {McGraw-Hill,},
	year = {2006.},
	address = {New York, N.Y. :},
	edition = {Thirteenth edition.},
	url = {http://www.loc.gov/catdir/enhancements/fy0619/2004065550-d.html}
}