Piaget's theory of intellectual development
Ginsburg, Herbert.
Opper, Sylvia.
Englewood Cliffs London Prentice-Hall
1979
Previous ed.: 1969
Bibliography: p.239-244. - Includes index
ISBN 0-13-675132-6 Pbk : £5.05
Piaget, Jean, 1896-1980.
Cognition in children.