Gaya APA

w.Drs, L. (1991). English for specific purposes: Dialogues for secretaries 2 (Cet. 1). Jakarta: Gramedia Pustaka Utama.

Gaya MLA

w.Drs, Lukito. "English for specific purposes: Dialogues for secretaries 2". Cet. 1 Jakarta: Gramedia Pustaka Utama, 1991. 400_Language.