Gaya APA
Riyanto, S., Suryani, L. (2021).
The Complete Book of The IELTS Preparation: Panduan Persiapan Tes IELTS (1).
Yogyakarta:
Penerbit Andi.
Gaya MLA
Riyanto, Slamet., Suryani, Laila.
"The Complete Book of The IELTS Preparation: Panduan Persiapan Tes IELTS".
1
Yogyakarta:
Penerbit Andi,
2021.
Text.