TY  - BOOK
AU  - Conference on Oridnnal Scales of Cognitive Developement
AU  - Ross, Green Donald
TI  - Measurement and piaget
U1  - 155.41390 
PY  - 1971///
CY  - New York
PB  - McGraw-Hill
KW  - Cognition in children
KW  - Scale analysis (Psychology)
ER  -