Elmes David G. Research Methods In Psychology / David G. Elmes Barry H. Kantowitz And Henry L. Roedigeriii - 9th ed. - Belmont Ca : Wadsworth Cengage Learning C2012. - XX 458 P. : ILL. 24 CM. - 0 . ENG ISBN: 139781111351533 (Pbk) 101111351538 (Pbk)