Gaya APA
Rangkuti-Hasibuan, S. (1992).
English for specific purposes : tourism Indonesia socio-cultural life and travel .
Jakarta:
Dian Rakyat.
Gaya MLA
Rangkuti-Hasibuan, Sofia.
"English for specific purposes : tourism Indonesia socio-cultural life and travel".
Jakarta:
Dian Rakyat,
1992.
Text.