@book{135847,
	author = {Mason, Robert Deward,  and Mayer, Morris Lehman.},
	title = {Statistical techniques in business and economics},
	publisher = {R. D. Irwin},
	year = {1978.},
	series = {Irwin series in quantitative analysis for business},
	address = {Homewood, Ill.},
	edition = {4th. ed.}
}