Gaya APA
Riyanto, S.
(2011).
English for your better future speak english please 3
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"English for your better future speak english please 3".
Yogyakarta:
Pustaka Pelajar,
2011.
Text.