Gaya APA
Riyanto. (2008).
The 1st students choice TOEFL .
Yogyakarta:
Pustaka Pelajar.
Gaya Chicago
Riyanto.
The 1st students choice TOEFL.
Yogyakarta:
Pustaka Pelajar,
2008.
Text.
Gaya MLA
Riyanto.
The 1st students choice TOEFL.
Yogyakarta:
Pustaka Pelajar,
2008.
Text.
Gaya Turabian
Riyanto.
The 1st students choice TOEFL.
Yogyakarta:
Pustaka Pelajar,
2008.
Print.