Gaya APA
Riyanto, Slamet. (2004).
Gateway english for active communication .
Yogyakarta:
Pustaka Pelajar.
Gaya Chicago
Riyanto, Slamet.
Gateway english for active communication.
Yogyakarta:
Pustaka Pelajar,
2004.
Text.
Gaya MLA
Riyanto, Slamet.
Gateway english for active communication.
Yogyakarta:
Pustaka Pelajar,
2004.
Text.
Gaya Turabian
Riyanto, Slamet.
Gateway english for active communication.
Yogyakarta:
Pustaka Pelajar,
2004.
Print.