Kagan, Jerome. Janis, Irving L., ed.

Kennedy, Wallace A.

Mitchell, John J., comp.

Wesley, Frank, 1918-

Zaporozhets, Aleksandr Vladimirovich, 1905- ed. Elkonin, D. B., ed.

Adler, Manfred, 1936-

Kagan, Jerome. McCall, Robert B., collab.

CTB/McGraw-Hill Conference on Ordinal Scales of Cognitive Development (1969 : Monterey, Calif. and Carmel, Calif.) Green, Donald Ross, ed. Ford, Marguerite P., ed. Flamer, George B., ed.

Piaget, Jean, 1896-

Sears, Pauline Snedden, comp.

Menyuk, Paula.

Wenar, Charles.