Gaya APA

Heo, S., Irene, C. (2010). Why ? Environment (Why ? Lingkungan) . Jakarta: Elex Media Komputindo.

Gaya MLA

Heo, Soon-Boong., Irene, Crishtin. "Why ? Environment (Why ? Lingkungan)". Jakarta: Elex Media Komputindo, 2010. Text.