Wadsworth, Barry J. Piaget's theory of cognitive development; an introduction for students of psychology and education, by Barry J. Wadsworth. - New York, McKay [1971] - xiii, 140 p. illus. 21 cm. Bibliography: p. 135-138. LCCN: 73151157 Subjects--Personal Names: Piaget, Jean, 1896-1980. Subjects--Topical Terms: Cognition in children. LC Class. No.: BF723.C5 / WAD 1971 Dewey Class. No.: 155.41/3