Gaya APA
Riyanto, S., Suryani, L. (2021).
The complete book of the IELTS preparation : panduan persiapan tes IELTS .
Yogyakarta:
ANDI.
Gaya MLA
Riyanto, Slamet., Suryani, Laila.
"The complete book of the IELTS preparation : panduan persiapan tes IELTS".
Yogyakarta:
ANDI,
2021.
Text.