TY  - BOOK
AU  - Piaget,Jean
TI  - The child's conception of number
U1  - 155.4/1323 21
PY  - 1965///
CY  - New York
PB  - W.W. Norton & Co.
KW  - Number concept in children
KW  - Cognition in children
N1  - Includes bibliogr. references and index
ER  -