Gaya APA

Hasibuan, S, R. (1992). English For Specific Purposes : Tourism Indonesian Socio-Cultural Life and Travel (Cet 1). Jakarta: Dian Rakyat.

Gaya MLA

Hasibuan, Sofia, Rangkuti. "English For Specific Purposes : Tourism Indonesian Socio-Cultural Life and Travel". Cet 1 Jakarta: Dian Rakyat, 1992. Text.