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