@book{8089,
	author = {Wonnacott, Thomas H., and Wonnacott, Ronald J.,},
	title = {Introductory statistics /},
	publisher = {Wiley,},
	year = {c1972.},
	series = {Wiley series in probability and mathematical statistics.},
	address = {New York :},
	edition = {3d ed.}
}