TY  - BOOK
AU  - Ginsburg Herbert
AU  -  Opper Sylvia
TI  - Piaget's theory of intellectual develoment :  An introduction
U1  - S1xM96:g, L9;1 
PY  - 1979///
CY  - Englewood
PB  - Prentice Hall      
KW  - PSYCHOLOGY
ER  -