@book{11327,
	author = {Harwell, Edward M., and Shaffer, Paul Franklin,},
	title = {The check-out operation in self-service retail food stores /},
	publisher = {U.S. Dept. of Agriculture, Production and Marketing Administration, Marketing and Facilities Branch,},
	year = {1951.},
	address = {Washington, D.C. :},
	note = {Cover title.}
}