Gaya APA

Kruse, B., Kruse, B. (1982). Instrumental English ; English for The Travel Industry . New York: McGrawHill Companies.

Gaya MLA

Kruse, Benedict., Kruse, Bettijune. "Instrumental English ; English for The Travel Industry". New York: McGrawHill Companies, 1982. FKSB-Sastra Inggris.