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.
BUKU TEKS.