Penggayaan APA
DUFF, Alan. (1981).
The third language .
Oxford:
Pergamon.
Chicago Style
DUFF, Alan.
The third language.
Oxford:
Pergamon,
1981.
Text.
MLA Style
DUFF, Alan.
The third language.
Oxford:
Pergamon,
1981.
Text.
Turabian Style
DUFF, Alan.
The third language.
Oxford:
Pergamon,
1981.
Print.