People speak out
Rewi Alley, 1954
Buku Teks SO
Alberti, Robert E.
Stand up, speak out, talk back
Pocket Books, 1975
Buku Teks SO
Bovee, Courtland L.
Business communication today
McGraw-Hill, 1993
Buku Teks SO
Bovee, Courtland L.
Business communication today
Prentice-Hall, 2005
Buku Teks SO
Hill, Charles W.L.
Global business today
Crwin Mcgraw-Hill, 1998
Buku Teks