TY  - BOOK
AU  - Chalak,Hatem
TI  - Building up Mathematics. 9th Grade, Basic education 
T2  - Le livre scolaire national
U1  - CRDP 510.712 Math. Gr.9 
PY  - 2012///
CY  - Beirut
PB  - Centre de Recherche et de Développement Pédagogiques
KW  - Mathematics --Study and teaching (Secondary Grade 9) -- Textbooks
ER  -