TY  - BOOK
AU  - CTB/McGraw-Hill Conference On Ordinal Scales Of Cognitive Development
ED  - CTB/McGraw-Hill Conference On Ordinal Scales Of Cognitive Development
TI  - Proceedings : measurement and diaget ed by Donald Ross Greetn etc
U1  - S:4p1:N71, L1 
PY  - 1971///
KW  - THEORY OF KNOWLEDGE; PSYCHOLOGY
ER  -