Gaya APA

Nicholas, J., Language, T, E. (2018). Smart Toefl / Jeffry Nicholas (Cet. 1). Jakarta: Sembilan Cahaya Abadi.

Gaya MLA

Nicholas, Jeffry., Language, Team, English. "Smart Toefl / Jeffry Nicholas". Cet. 1 Jakarta: Sembilan Cahaya Abadi, 2018. Text.