Gaya APA
Helgesen,Marc. (2001).
Firsthand Access Beeginners Course 1 .
Hongkong:
Longman.
Gaya Chicago
Helgesen,Marc.
Firsthand Access Beeginners Course 1.
Hongkong:
Longman,
2001.
.
Gaya MLA
Helgesen,Marc.
Firsthand Access Beeginners Course 1.
Hongkong:
Longman,
2001.
.
Gaya Turabian
Helgesen,Marc.
Firsthand Access Beeginners Course 1.
Hongkong:
Longman,
2001.
.