TY  - BOOK
AU  - Sigel Irving E ed
TI  - New directions in piagetian theory and practice
U1  - T0bS1xM96, M1 
PY  - 1981///
CY  - Hillsdale
PB  - Lawrence Erlbaum Associates     
KW  - EDUCATION
N1  - Includes bib
ER  -