@book{14667,
	author = {Welkowitz, Joan. and Ewen, Robert B.,},
	title = {Introductory statistics for the behavioral sciences /},
	publisher = {Harcourt Brace Jovanovich,},
	year = {c1991.},
	address = {San Diego :},
	edition = {4th ed.},
	note = {Includes index.}
}