TY  - BOOK
AU  - Piaget,Jean
AU  - Gruber,Howard E
AU  - Voneche,Jacques g
TI  - The essential Piaget
SN  - 0710087780
PY  - 1977///
CY  - London
PB  - Routledge & K. Paul
KW  - Cognition in children
KW  - Knowledge, Theory of
KW  - Collected works
KW  - Biology
N1  - Includes index; Bibliography: p. 861-866
ER  -