Gaya APA
Marc Helgesen, dkk.. (2010).
English firsthand 1 (Ed.1).
Hong Kong:
pearson longman.
Gaya Chicago
Marc Helgesen, dkk..
English firsthand 1.
Ed.1
Hong Kong:
pearson longman,
2010.
Text.
Gaya MLA
Marc Helgesen, dkk..
English firsthand 1.
Ed.1
Hong Kong:
pearson longman,
2010.
Text.
Gaya Turabian
Marc Helgesen, dkk..
English firsthand 1.
Ed.1
Hong Kong:
pearson longman,
2010.
Print.