TY  - BOOK
AU  - Langer,Jonas
TI  - The origins of logic: six to twelve months 
SN  - 0124361501
AV  - BF723.C5 L364
U1  - 160 
PY  - 1980///
CY  - New York
PB  - Academic Press
KW  - Cognition in infants
KW  - Logic
KW  - Infant psychology
N1  - Includes index; Bibliography: p. 433-434
ER  -