TY  - BOOK
AU  - Ginsburg, Herbert 
AU  -  Opper, Sylvia
TI  - Piagets theory of interllectual development: an introduction 
SN  - 136749526
AV  - BF721 .G58 1969 
PY  - 1969///
CY  - New Jersey
PB  - Prentice Hall
KW  - Intellectual development
ER  -