Heiman, Gary W. Basic statistics for the behavioral sciences / Gary W. Heiman. - 6th ed. - Belmont, CA : Wadsworth Cengage Learning, 2011. - xxvii, 468 p. : ill. ; 27 cm. ISBN: 9780840031433 (hbk.) Subjects--Topical Terms: Social sciences--Statistical methods.Psychometrics. Dewey Class. No.: 300.727 / HEI 2011