Gaya APA

Riyanto, S. et al (2021). The complete book of the IELTS preparation : panduan persiapan tes IELTS (Ed. 1). Yogyakarta: Andi.

Gaya MLA

Riyanto, Slamet. et al. "The complete book of the IELTS preparation : panduan persiapan tes IELTS". Ed. 1 Yogyakarta: Andi, 2021. TEXT.