Gaya APA
RIYANTO, S.
(2004).
Gateway english for active communication/ Slamet Riyanto
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
RIYANTO, Slamet.
"Gateway english for active communication/ Slamet Riyanto".
Yogyakarta:
Pustaka Pelajar,
2004.
Text.