Gaya APA

Postill, S. (1995). Travel by air: English For Special Purpose ( ESP) Coversational Approch (c-1). Jakarta: Visipro.

Gaya MLA

Postill, Sara-Jane. "Travel by air: English For Special Purpose ( ESP) Coversational Approch". c-1 Jakarta: Visipro, 1995. 400_Language.