Lewis, William C. , 1917- Why people change : the psychology of influence / William C. Lewis - New York : Holt, Rinehart and Winston, c1972 - xii, 241 p. ; 23 cm. Includes index ISBN: 0030860288 : USD 6.50 Subjects--Topical Terms: Influence (Psychology)Psychotherapy Dewey Class. No.: 136.2