@book{118940,
	author = {Pfaffenberger, Roger C., and Patterson, James Herbert,},
	title = {Statistical methods for business and economics /},
	publisher = {R.D. Irwin,},
	year = {1981.},
	series = {The Irwin series in quantitative analysis for business},
	address = {Homewood, Ill. :},
	edition = {Rev. ed.}
}