TY  - BOOK
AU  - PIAGET, Jean
AU  - INHELDER, Barbel
TI  - The child's construction of quantities
SN  - 0710078870
U1  - 160 PIA 
PY  - 1974///
CY  - London
PB  - Routledge and Kegan Paul
N1  - include index
ER  -