Gaya APA
Rangkuti, S., Hasibuan, . (1994).
English for Specific Purposes: The Pesantren Elementary Volume I .
Jakarta:
Dian Rakyat.
Gaya MLA
Rangkuti, Sofia., Hasibuan, .
"English for Specific Purposes: The Pesantren Elementary Volume I".
Jakarta:
Dian Rakyat,
1994.
Book.