Engle,T.L. Psychology: its principles and applications / T.L. Engle and Louis Snellgrove - 6th ed. - New York : Harcourt Brace Jovanovich , 1974 - 535 p. : ill. ; 24 cm. Includes bibliographical references and index. Subjects--Topical Terms: Psychology. LC Class. No.: BF131 / .E58 1974