TY  - BOOK
AU  - Gelman,Rochel
AU  - Gallistel,C.R.
TI  - The child's understanding of number
SN  - 0674116364 :
U1  - 372.7 
PY  - 1978///
CY  - Cambridge, Mass.
PB  - Harvard University Press
KW  - Number concept
N1  - Includes bibliographical references and index
ER  -