Gaya APA
Riyanto, Slamet. (2010).
Let's speak English actively .
Yogyakarta:
Pustaka Pelajar.
Gaya Chicago
Riyanto, Slamet.
Let's speak English actively.
Yogyakarta:
Pustaka Pelajar,
2010.
Text.
Gaya MLA
Riyanto, Slamet.
Let's speak English actively.
Yogyakarta:
Pustaka Pelajar,
2010.
Text.
Gaya Turabian
Riyanto, Slamet.
Let's speak English actively.
Yogyakarta:
Pustaka Pelajar,
2010.
Print.