TY  - BOOK
AU  - Piaget,Jean
TI  - The child's conception of physical causality,
AV  - BF721 .P43
U1  - 136.72 
PY  - 1930///
CY  - London, New York
PB  - K. Paul, Trench, Trubner & co. ltd., Harcourt, Brace & company
KW  - Child psychology
N1  - "Translated by Marjorie Gabain."
ER  -