Gaya APA

Rangkuti, S., Hasibuan, . (1992). English For Specific Purposes : tourism indonesian socio-cultural life and travel 1 . : Dian Rakyat.

Gaya MLA

Rangkuti, Sofia., Hasibuan, . "English For Specific Purposes : tourism indonesian socio-cultural life and travel 1". : Dian Rakyat, 1992. Text.