George, Darren SPSS for Windows step by step : a simple guide and reference, 17.0 update / Darren George, Paul Mallery - 10th ed. - Boston, Mass. : Allyn & Bacon, c2010 - 386 p. : ill. Includes bibliographical references and index ISBN: 9780205755615 LC Class. No.: HA32 / G467S 2010