TY  - BOOK
AU  - Van de Walle John A
TI  - Teaching student-centered mathematics. Developmentally appropriate instruction for grades 6-8
U1  - 510 
KW  - 500 áá·áááá¶áá¶ááááááááááá¶áá· áá·áááá·ááá·áááá¶
ER  -