WHITEHEAD, G., & WHITEHEAD, D. H. (1989). Pitman business correspondence. Binarupa Aksara.
Chicago-čujuhus (17. p.)WHITEHEAD, Geoferry, juo David H. WHITEHEAD. Pitman Business Correspondence. Jakarta: Binarupa Aksara, 1989.
MLA-čujuhus (9. p.)WHITEHEAD, Geoferry, juo David H. WHITEHEAD. Pitman Business Correspondence. Binarupa Aksara, 1989.
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