Gaya APA
Sofyan, F. (2017).
Conversation and Correspondence in Business English (Cet.2).
Jakarta Selatan:
Pustaka Tarbiah Baru.
Gaya MLA
Sofyan, Fahmi.
"Conversation and Correspondence in Business English".
Cet.2
Jakarta Selatan:
Pustaka Tarbiah Baru,
2017.
Text.