Gaya APA
Nurul, H., Rizka, H. (2015).
IELTS preparation : lets get the highest score for IELTS .
Yogyakarta:
Pustaka Baru Press.
Gaya MLA
Nurul, Hidayati,Niswatin., Rizka, Haira.
"IELTS preparation : lets get the highest score for IELTS".
Yogyakarta:
Pustaka Baru Press,
2015.
Text.