APA Style
Riyanto, S., Suryani, L. (2021).
The Complete Book of the IELTS Preparation : panduan persiapan tes IELTS .
YOGYAKARTA:
ANDI.
MLA Style
Riyanto, Slamet., Suryani, Laila.
"The Complete Book of the IELTS Preparation : panduan persiapan tes IELTS".
YOGYAKARTA:
ANDI,
2021.
Text.