Howitt, Dennis. Introduction to research methods in psychology / Dennis Howitt, Duncan Cramer. - 3rd ed. - Harlow : Pearson/Prentice Hall, 2011. - xxii, 449 p. : ill. (some col.) ; 27 cm. Includes bibliographical references and index. ISBN: 9780273726074 (pbk.) Subjects--Topical Terms: Psychology--Research--Methodology. Dewey Class. No.: 150.72 / HOW 2011