TY  - BOOK
AU  - Conference On Ordinal Scales Of Cognitive Development , 1970 (California)
ED  - Conference On Ordinal Scales Of Cognitive Development , 1970 (California)
TI  - Proceedings :  measurement and piaget, ed by Donald Ross Green etc
U1  - S:4p1:N70, L1-;1 
PY  - 1971///
KW  - THEORY OF KNOWLEDGE; PSYCHOLOGY
ER  -