Gaya APA

Center, T, I, R. (2016). Toefl Killer : Cara pasti mendapat skor toefl 600 / Tim Inspira Research Center (Cet. 9). Yogyakarta: Inspira Research Center.

Gaya MLA

Center, Tim, Inspira, Research. "Toefl Killer : Cara pasti mendapat skor toefl 600 / Tim Inspira Research Center". Cet. 9 Yogyakarta: Inspira Research Center, 2016. Text.