Wadsworth, Barry J. Piaget's theory of cognitive and effective development Barry J. Wadsworth ; with drawings by the author. - 4th ed. - New York Longman 1989. - xii, 212 p. ill. Includes index. Bibliography: p. 201-208. ISBN: 0801302005 LCCN: Subjects--Personal Names: Piaget, Jean, 1896-1980. Subjects--Topical Terms: Cognition in childrenEmotions in children