Farol, H. F. (1987). A manual 0f effective business correspondence. University Book Supply.
Chicago Style (17. basım) AtıfFarol, Honesto F. A Manual 0f Effective Business Correspondence. Manila: University Book Supply, 1987.
MLA (9th ed.) AtıfFarol, Honesto F. A Manual 0f Effective Business Correspondence. University Book Supply, 1987.
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