Gaya APA

4 Friends. (2007). Yogyakarta: Sheila.

Gaya Chicago

4 Friends. . Yogyakarta: Sheila, 2007. Text.

Gaya MLA

4 Friends. . Yogyakarta: Sheila, 2007. Text.

Gaya Turabian

4 Friends. Yogyakarta: Sheila, 2007. Print.