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.