Gaya APA
Riyanto, S.
(2011).
Speak English, Please 1
(
cet.3)
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"Speak English, Please 1".
cet.3
Yogyakarta:
Pustaka Pelajar,
2011.
Text.