TY  - BOOK
AU  - Van de walle, John A.
TI  - elementary and middle school mathematics: teaching developmentally
SN  - 0205483925
AV  - QA 135.6  .V36 2007
PY  - 2007///
CY  - new york
PB  - Pearson education
KW  - Mathematics
KW  - study and teaching (elementary)
KW  - study and taeching
ER  -