Gaya APA
Riyanto, S.
(2010).
Developing Vocabulary Skills Book 3
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"Developing Vocabulary Skills Book 3".
Yogyakarta:
Pustaka Pelajar,
2010.
Buku Tex.