Gaya APA
Riyanto, S. et al (2021).
The complete book of the IELTS preparation : panduan persiapan tes IELTS (Ed. 1).
Yogyakarta:
Andi Offset.
Gaya MLA
Riyanto, Slamet. et al.
"The complete book of the IELTS preparation : panduan persiapan tes IELTS".
Ed. 1
Yogyakarta:
Andi Offset,
2021.
Text.