Gaya APA

Betsis, A., Mamas, L. (2016). Succeed in IELTS (Ed. 1 Cet. 1). Jakarta: Erlangga.

Gaya MLA

Betsis, Andrew., Mamas, Lawrence. "Succeed in IELTS". Ed. 1 Cet. 1 Jakarta: Erlangga, 2016. Text.