TY  - BOOK
AU  - Hock Sun, Thomas Wong 
ED  - REDSPOT Publications 
TI  - Challenging Mathematics for 'O' Level 
SN  - 9789810517403
PY  - 2009///
CY  - Singapore 
PB  - REDSPOT Publications 
KW  - Mathematics -- Study and Teaching (Secondary)
KW  - Mathematics -- Problemsm exercises, etc
KW  - Matehmatics -- examinations questions, etc
ER  -