TY  - BOOK
AU  - Piaget,Jean
AU  - Inhelder, Barbel
TI  - The child's conception of space / 
U1  - 153.752 
PY  - 1956///
CY  - London : 
PB  - Routledge & Kegan Paul, 
KW  - Space perception
KW  - Space perception in children
N1  -  Includes bibliographical references and index
ER  -