Gaya APA

Hasibuan, S, R, -. (1993). English For Spesific Purposes : Tourism Hotel A Major in The Academy of Tourism (Cet 1). Jakarta: Dian Rakyat.

Gaya MLA

Hasibuan, Sofia, Rangkuti, -. "English For Spesific Purposes : Tourism Hotel A Major in The Academy of Tourism". Cet 1 Jakarta: Dian Rakyat, 1993. Text.