Gaya APA

Betsis, A., Mamas, L. (2016). Succed in the TOEFL IBT test : self-practice, authentic test format, practical usage (Original Edition). Jakarta: Erlangga.

Gaya MLA

Betsis, Andrew., Mamas, Lawrence. "Succed in the TOEFL IBT test : self-practice, authentic test format, practical usage". Original Edition Jakarta: Erlangga, 2016. Text.