Gaya APA

Betsis, A., Mamas, L. (2013). Succeed in The Toefl iBT Test (Ed. 1, Cet. 1). Jakarta: Erlangga.

Gaya MLA

Betsis, Andrew., Mamas, Lawrence. "Succeed in The Toefl iBT Test". Ed. 1, Cet. 1 Jakarta: Erlangga, 2013. Text.