Gaya APA
Riyanto, S.
(2005).
Gateway English For Active Communication
(
cet.3)
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"Gateway English For Active Communication".
cet.3
Yogyakarta:
Pustaka Pelajar,
2005.
Text.