Gaya APA

Natalia, E., Yogaswara, A. (2007). Amicizia . Yogyakarta: Gramedia Pustaka Utama.

Gaya MLA

Natalia, Eliza., Yogaswara, Arisatya. "Amicizia". Yogyakarta: Gramedia Pustaka Utama, 2007. Book.