Keenan, John
Feel free to write : guide for business and professional people / John Keenan
John Wiley & Sons, 1982
 Buku Teks
Bowman, Joel P., author
Effective business correspondence
Harper & Row Publishers, 1979
 Buku Referensi
King, F.W
English business letters : commercial correspondence for foreign students/F.W. King, D. Ann Cree.
Longmans , 1979
 Buku Teks
Aurner, Robert Ray
Manual for effective business correspondence / Robert Ray Aurner
South-Western Publishing Company, 1939
 Buku Teks
Sigband, Norman B.
Effective report writing, for business, industry, and government / Norman B. Sigband
Harper & Brothers Publ , 1960
 Buku Teks
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