Gaya APA
Riyanto, S.
(2011).
Easy Writing : A Letter of aplication in English
.
Yogyakarta:
Pustaka Belajar.
Gaya MLA
Riyanto, Slamet.
"Easy Writing : A Letter of aplication in English".
Yogyakarta:
Pustaka Belajar,
2011.
Text.