Gaya APA
Rizka, H., Hidayati, N, N. (2018).
IELTS Preparation Lets Get The Highest Score IELTS .
Yogyakarta:
Pustaka Baru press.
Gaya MLA
Rizka, Haira., Hidayati, Niswatin, Nurul.
"IELTS Preparation Lets Get The Highest Score IELTS".
Yogyakarta:
Pustaka Baru press,
2018.
Text.