Gaya APA

ISABELLA, C. et al (2014). A SONG FOR ALEXA . PT. GRAMEDIA USTAA UTAMA: PT.Gramedia pustaka utama.

Gaya MLA

ISABELLA, CHYNTIA. et al. "A SONG FOR ALEXA". PT. GRAMEDIA USTAA UTAMA: PT.Gramedia pustaka utama, 2014. Text.