Gaya APA
Sofyan, F. (2019).
Conversation and Correspondence in Business English (Dilengkapi CD) (Cet.5).
Jakarta:
Pustaka Tarbiyah Baru.
Gaya MLA
Sofyan, Fahmi.
"Conversation and Correspondence in Business English (Dilengkapi CD)".
Cet.5
Jakarta:
Pustaka Tarbiyah Baru,
2019.
Textbook.