Gaya APA
Riyanto, S., Suryani, L. (2021).
The Complete Book of IELTS Preparation: Panduan Persiapan Tes IELTS .
Yogyakarta:
Andi.
Gaya MLA
Riyanto, Slamet., Suryani, Layla.
"The Complete Book of IELTS Preparation: Panduan Persiapan Tes IELTS".
Yogyakarta:
Andi,
2021.
Text.