TY  - BOOK
AU  - John A.Van de Walle
AU  - Van de Walle, John A.
TI  - Elementary and middle school mathematics: Teaching developmentally
SN  - 0801332532
AV  - QA 135.5.V335 2000 
PY  - 2000///
CY  - London
PB  - Longman
KW  - Mathematics-Study and teaching
ER  -