Gaya APA

Hasibuan, S, R. (1993). English For Specific Purposes : Tourism Hotel A Major In The Academy Of Tourism (Cet 1). Jakarta: Dian Rakyat.

Gaya MLA

Hasibuan, Sofia, Rangkuti. "English For Specific Purposes : Tourism Hotel A Major In The Academy Of Tourism". Cet 1 Jakarta: Dian Rakyat, 1993. Text.