Gaya APA

Case, D., Pudjadi, A. (1996). Let's Speak English 1 (ed. 1, cet.17). Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Case, Doug., Pudjadi, Antonius. "Let's Speak English 1". ed. 1, cet.17 Jakarta: Gramedia Pustaka Utama, 1996. Text.