@book{33795,
	author = {Wonnacott, Thomas H., and Wonnacott, Ronald J.,},
	title = {Introductory statistics /},
	publisher = {Wiley,},
	year = {c1977.},
	series = {Wiley series in probability and mathematical statistics},
	address = {New York :},
	edition = {3d ed.}
}