Gaya APA
RIYANTO, S.
(2009).
Gateway English For Active Communication / Slamet Riyanto
(
Cet.Ke-6)
.
:
Pustaka Pelajar.
Gaya MLA
RIYANTO, Slamet.
"Gateway English For Active Communication / Slamet Riyanto".
Cet.Ke-6
:
Pustaka Pelajar,
2009.
Referensi.