Gaya APA
Riyanto, S.
(2011).
12 Tenses to Master in A Day
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"12 Tenses to Master in A Day".
Yogyakarta:
Pustaka Pelajar,
2011.
Text.