TY  - BOOK
AU  - Piaget, J
AU  - Gruber,H E
AU  - Voneche, J J
TI  - The essential Piaget
SN  - 0710087780
PY  - 1977///
PB  - Routledge & Kegan Paul
KW  - Developmental psychology
KW  - Child psychology
KW  - Cognition
ER  -