Gaya APA
Riyanto. (2010).
Developing, vocabulary skills .
Yogyakarta:
Pustaka Pelajar.
Gaya Chicago
Riyanto.
Developing, vocabulary skills.
Yogyakarta:
Pustaka Pelajar,
2010.
Text.
Gaya MLA
Riyanto.
Developing, vocabulary skills.
Yogyakarta:
Pustaka Pelajar,
2010.
Text.
Gaya Turabian
Riyanto.
Developing, vocabulary skills.
Yogyakarta:
Pustaka Pelajar,
2010.
Print.