TY  - BOOK
AU  - Wadsworth,Barry J.
TI  - Piaget's theory of cognitive development: an introduction for students of psychology and education,
AV  - BF723.C5 WAD 1971
U1  - 155.41/3 
PY  - 1971///]
CY  - New York
PB  - McKay
KW  - Piaget, Jean,
KW  - Cognition in children
N1  - Bibliography: p. 135-138
ER  -