Gaya APA

DKK, J, C. (1994). SPEAKING EFFECTIVELY : DEVELOPING SPEAKING SKILLS FOR BUSINESS ENGLISH (CET. 1). NEW YORK: CAMBRIDGE UNIVERSITY PRESS.

Gaya MLA

DKK, JEREMY, COMFORT,. "SPEAKING EFFECTIVELY : DEVELOPING SPEAKING SKILLS FOR BUSINESS ENGLISH". CET. 1 NEW YORK: CAMBRIDGE UNIVERSITY PRESS, 1994. Prodi S1 Sastra Inggris.