Gaya APA
Hidayati, N, N., Rizka, H.
(2015).
IELTS Preparation
.
Yogyakarta:
Pustaka Baru Press.
Gaya MLA
Hidayati, Niswatin, Nurul., Rizka, Haira.
"IELTS Preparation".
Yogyakarta:
Pustaka Baru Press,
2015.
Teks.