Gaya APA
Riyanto, S.
(2010).
Essentials Of English Grammar For Fluent English
.
Yogyakarta:
Pustaka pelajar.
Gaya MLA
Riyanto, Slamet.
"Essentials Of English Grammar For Fluent English".
Yogyakarta:
Pustaka pelajar,
2010.
Text.