SUPONO, I. (1991). Business dialogues: Indonesian - English. Titik Terang.
Chicago-čujuhus (17. p.)SUPONO, Idhie. Business Dialogues: Indonesian - English. Jakarta: Titik Terang, 1991.
MLA-čujuhus (9. p.)SUPONO, Idhie. Business Dialogues: Indonesian - English. Titik Terang, 1991.
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