TY  - BOOK
AU  - Piaget,Jean
TI  - Six psychological studies
AV  - BF311 .P5213 1967
U1  - 153.4 
PY  - 1967///]
CY  - New York
PB  - Random House
KW  - Psychology
KW  - Cognition
N1  - Bibliography: p. [159]-162
ER  -