Gaya APA
Riyanto, S.
(2010).
Let's Speak English Actively
(
edisi 1)
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"Let's Speak English Actively".
edisi 1
Yogyakarta:
Pustaka Pelajar,
2010.
Text.