TY  - BOOK
AU  - Langer,Jonas
TI  - The origins of log : : from six to twelve months 
SN  - 0124361501
PY  - 1980///
CY  - New York : 
PB  -  Academic Press
KW  - Cognition in children
KW  - Logic
KW  - Infant psychology
N1  - Bibliography : p . 433-434
ER  -