@book{9692,
	author = {George, Darren and Mallery, Paul},
	title = {SPSS for windows step by step : A Simple guide and reference 10.0 update},
	publisher = {Allyn and Bacon, },
	year = {c2001},
	address = {Boston: },
	edition = {3nd ed},
	note = {Includes bibliographical references and index}
}