Gaya APA
Riyanto, S.
(2005).
Gateway english for active communication : Slamet Riyanto
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"Gateway english for active communication : Slamet Riyanto".
Yogyakarta:
Pustaka Pelajar,
2005.
Text.