TY  - BOOK
AU  - Green,Donald Ross
AU  - Ford,Marguerite P.
AU  - Flamer,George B.
ED  - Conference on Ordinal Scales of Cognitive Development
TI  - Measurement and Piaget: proceedings 
U1  - 136.72 
PY  - 1971///
CY  - New York
PB  - McGraw-Hill
KW  - Piaget, Jean,
KW  - Cognition in children
KW  - Congresses
KW  - Scale analysis (Psychology)
N1  - Includes index
ER  -