Gaya APA
Hanggarini, P. (2007).
English for undergraduate students of international relations/ Peni Hanggarini .
Sebastopol, CA:
Humaniora.
Gaya MLA
Hanggarini, Peni.
"English for undergraduate students of international relations/ Peni Hanggarini".
Sebastopol, CA:
Humaniora,
2007.
Text.