Gaya APA

Palmer, D., Putri, B, S, A. (2010). Natal sang koboi = Christmas cowboy . Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Palmer, Diana., Putri, Beatha, Saskiya, Astamarindra. "Natal sang koboi = Christmas cowboy". Jakarta: Gramedia Pustaka Utama, 2010. Text.