Gaya APA
Seng, E, S, K. (2009).
Practical english for teriary students book 1 .
Singapore:
Cengage Learning Asia Pte.Ltd..
Gaya MLA
Seng, Edwin, Soo, Kim.
"Practical english for teriary students book 1".
Singapore:
Cengage Learning Asia Pte.Ltd.,
2009.
Text.