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