Gaya APA

Foster, D, L., Sastrio, T, B. (1991). Sales And Marketing For The Travel Profesional (Ed. 1). Jakarta: PT. Rajagrafndo Persada.

Gaya MLA

Foster, Dennis, L.., Sastrio, Tri, Budhi. "Sales And Marketing For The Travel Profesional". Ed. 1 Jakarta: PT. Rajagrafndo Persada, 1991. Text.