Gaya APA
Slamet, R.
(2013).
GATEWAY ENGLISH FOR ACTIVE COMMUNICATION
.
Yogyakarta ; Indonesia:
Pustaka Pelajar.
Gaya MLA
Slamet, Riyanto..
"GATEWAY ENGLISH FOR ACTIVE COMMUNICATION".
Yogyakarta ; Indonesia:
Pustaka Pelajar,
2013.
Textbook.