TY  - BOOK
AU  - Inhelder,Barbel
AU  - Piaget,Jean
AU  - Lunger,E.A
AU  - Papert,D
TI  - The early growth of logic in the child: classification and seriation 
U1  - 136.72 
PY  - 1964///
CY  - London
PB  - Routledge and Kegan Paul
KW  - Logic
N1  - Includes index
ER  -