Penggayaan APA
STUDENT Book 6. (2009).
England:
Pearson.
Chicago Style
STUDENT Book 6.
International Edition.
England:
Pearson,
2009.
Text.
MLA Style
STUDENT Book 6.
International Edition.
England:
Pearson,
2009.
Text.
Turabian Style
STUDENT Book 6.
England:
Pearson,
2009.
Print.