The future of unified messaging: research report
International Engineering Consortium
International Engineering Consortium, 2000
 eBooks
Business Communication
Holt, Rinehart and Winston of Canada, Limited, 1988
 Buku Teks
O`Hair, Dan, author
Strategic communication : in business and the professions
Kencana, 2009
 Buku Teks
Angell, David
The elements of e-mail style: communicate effectively via electronic mail / David Angell, Brent Heslop
Addison-Wesley Publishing Company, Inc., 1994
 Buku Teks
Business communication/Lee, Williams Lajuana… (et al.)
Houghton Miffiln, 1980
 Buku Teks
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