Gartside, L. (Leonard)
Model business letters : a classified selection of modern business letters for use in school and in business
Macdonald and Evans, 1982
 Buku Teks
Weaver, Patricia C.
Persuasive writing : a manager’s guide to effective letters and reports / Patricia C. Weaver, Robert G. Weaver
The Free Press, 1977
 Buku Teks
Murphy, Herta A.
Effective business communications / Herta A. Murphy, Herbert W. Hildebrandt
McGraw-Hill , 1991
 Buku Teks
Murphy, Herta A.
Effective business communications
McGraw-Hill , 1984
 Buku Teks
Murphy, Herta A.
Effective business communications / Herta A. Murphy, Herbert W. Hildebrandt
McGraw-Hill, 1976
 Buku Teks