TY  - BOOK
AU  - Voyat, Gilbert.
TI  - Piaget systematized
SN  - 0898590264
U1  - 155.4130924 
PY  - 1982///
CY  - Hillsdale, N.J.
PB  - L. Erlbaum Associates
KW  - Child development.-------
N1  - Includes index.----Bibliography: p. 201.-
ER  -