TY  - BOOK
AU  - Kohnstamm,Geldolph A.
TI  - Piaget's analysis of class inclusion: right or wrong 
U1  - 136.7 
PY  - 1968///
CY  - The Hague
PB  - Mouton
KW  - Piaget, Jean,
KW  - Number concept
KW  - Whole and parts (Psychology)
KW  - Child psychology
ER  -