TY  - BOOK
AU  - Peill,E.J.
TI  - Invention and discovery of reality: the acquisition of conservation of amount 
SN  - 0471677957 :
U1  - 136.7 
PY  - 1975///
CY  - London
PB  - John Wiley
KW  - Piaget, Jean,
KW  - Bruner, Jerome S.
KW  - Conservation of substance (Psychology)
KW  - Child psychology
N1  - Includes bibliographical references and index
ER  -