Gaya APA
Grolier Advanced English Course Book 4. (2004).
Kuala Lumpur:
Grolier International.
Gaya Chicago
Grolier Advanced English Course Book 4.
.
Kuala Lumpur:
Grolier International,
2004.
Reference.
Gaya MLA
Grolier Advanced English Course Book 4.
.
Kuala Lumpur:
Grolier International,
2004.
Reference.
Gaya Turabian
Grolier Advanced English Course Book 4.
Kuala Lumpur:
Grolier International,
2004.
Reference.