TY  - BOOK
AU  - Chalak,Hatem
TI  - Building up Mathematics. 9th Grade, Basic education. Teacher's guide 
T2  - Le livre scolaire national
U1  - CRDP 373.7 Math. Guide Gr.9 
PY  - 2000///
CY  - Beirut
PB  - Centre de Recherche et de Développement Pédagogiques
KW  - Mathematics -- Study and teaching (Secondary Grade 9) -- Teacher's guide
ER  -