TY  - BOOK
AU  - Wadsworth,Barry J.
TI  - Piaget's theory of cognitive development: an introduction for students of psychology and education 
SN  - 0679301631
U1  - 155.413 
PY  - 1971///
CY  - New York
PB  - McKay
KW  - Piaget, Jean,
KW  - Cognition in children
N1  - Also published New York: Longman; Bibliography: p. 135-138
ER  -