Gaya APA
Heng, H, H. (2006).
Learning Through Examples Mathematics Secondary 1 Normal (Academic) .
Singapore:
Pearson Education South Asia Pte Ltd.
Gaya MLA
Heng, Heng, Hwa.
"Learning Through Examples Mathematics Secondary 1 Normal (Academic)".
Singapore:
Pearson Education South Asia Pte Ltd,
2006.
.