Gaya APA

Ook, E, N, N, H. (2012). Why? : Establishment and Advancement of Europe = Pendirian dan Perkembangan Eropa (Cet. 1). Jakarta: Gospel Press, Batam.

Gaya MLA

Ook, Endah, Nawang, NoviantiCho, Han. "Why? : Establishment and Advancement of Europe = Pendirian dan Perkembangan Eropa". Cet. 1 Jakarta: Gospel Press, Batam, 2012. Text.