TY  - BOOK
AU  - Piaget, Jean
TI  - The child's conception of number
U1  - 155.413 
PY  - 1952///
CY  - New York
PB  - W. W. Norton & Company
KW  - Number concept in children
KW  - Cognition in children
N1  - [Translated By C. Gattegno And F. M. Hodgson]
ER  -