Gaya APA
Riyanto, S.
(2009).
Haw To Say It In English
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"Haw To Say It In English".
Yogyakarta:
Pustaka Pelajar,
2009.
Buku Tex.