TY  - BOOK
AU  - Sigel,Irving E.
TI  - Logical thinking in children: Research bases on piaget's theory 
AV  - BF723 C68S52
PY  - 1968///
CY  - New York
PB  - Holt
KW  - Piaget, Jean,
KW  - Niños
KW  - Crecimiento
ER  -