TY  - BOOK
AU  - Sigel, Irving E
AU  - Hooper, Frank H.
AU  - SIgel, Irving E.
AU  - Hooper, Frank H.
TI  - Logical thinking the Children; research based on Piaget's theory
U1  - 153 
PY  - 1968///
CY  - London
PB  - Holt Rinehart & Winston
KW  - Anicient Medieval & Eastern Philosophy
ER  -