TY  - BOOK
AU  - Piaget, Jean,
TI  - The child's conception of number
U1  - 155.4 
PY  - 1952///], repr. 1964
CY  - London
PB  - Routledge & Paul
KW  - Number concept in children
KW  - Cognition in children
N1  - Translation of La genáese du nombre chez l'enfant
ER  -