Bowman, Joel P.
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
Murphy, Herta A.
Effective business communications
McGraw-Hill, 1991
 Buku Teks