Gaya APA

Radford, S., Tripp, C. (2007). Penelope and the Humongous Burp . Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Radford, Sheri., Tripp, Christine. "Penelope and the Humongous Burp". Jakarta: Gramedia Pustaka Utama, 2007. Book.