Aurner, Robert Ray
Manual for effective business correspondence
South-Western Publishing, 1939
Buku Teks SO
King, F.W
English business letters : commercial correspondence for foreign students/F.W. King, D. Ann Cree.
Longmans , 1979
Buku Teks SO
Bouwens, C.
English Commercial correspondence
Persatuan Tenaga, 1957
Buku Teks SO
Sigband, Norman B.
Effective report writing, for business, industry, and government
Harper & Brothers, 1960
Buku Teks SO
Murphy, Herta A.
Effective business communications
McGraw-Hill, 1991
Buku Teks SO