Murphy, Herta A.
Effective business communications
McGraw-Hill, 1991
 Buku Teks
Murphy, Herta A.
Effective business communications
McGraw-Hill, 1976
 Buku Teks
Murphy, Herta A.
Effective business communications
McGraw-Hill , 1984
 Buku Teks
Sigband, Norman B.
Effective report writing, for business, industry, and government / Norman B. Sigband
Harper & Brothers Publ , 1960
 Buku Teks
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