Gaya APA
sofyan, I, F. (2019).
conversation and correspondence in business english (Cet.6).
Jakarta Selatan:
pustaka tarbiyah baru.
Gaya MLA
sofyan, Ir., Fahmi.
"conversation and correspondence in business english".
Cet.6
Jakarta Selatan:
pustaka tarbiyah baru,
2019.
Text.