Gaya APA
Heng, H, H. (2005).
Learning Through Examples Mathematics Secondary 1 Spesial/Express .
Singapore:
Pearson Education South Asia Pte Ltd.
Gaya MLA
Heng, Heng, Hwa.
"Learning Through Examples Mathematics Secondary 1 Spesial/Express".
Singapore:
Pearson Education South Asia Pte Ltd,
2005.
.