Gaya APA

Hasibuan, R, S. (1992). English for specific purposes : tourism I indonesian socio-cultural life and travel (cet 1). Jakarta: Dian Rakyat.

Gaya MLA

Hasibuan, Rangkuti, Sofia,. "English for specific purposes : tourism I indonesian socio-cultural life and travel". cet 1 Jakarta: Dian Rakyat, 1992. BUKU.