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
Free Press, 1977
Buku Teks
Murphy, Herta A.
Effective business communications
McGraw-Hill, 1991
Buku Teks
Murphy, Herta A.
Effective business communications
McGraw-Hill , 1984
Buku Teks
Murphy, Herta A.
Effective business communications
McGraw-Hill, 1976
Buku Teks