TY  - BOOK
AU  - Lunzer E A
AU  - Piaget Jean
TI  - Early growth of logic in the child: classification and seriation
U1  - 136.7 
PY  - 1964///
CY  - London
PB  - Routledge & Kegan Paul
KW  - Child psychology
KW  - Differential psychology
KW  - Psychology
N1  - Tr. from French
ER  -