Roman, Murray, author
Telephone marketing
McGraw-Hill, 1976
 Buku Teks
Briley, Bruce E.
Introduction to telephone switching / Bruce E. Briley
Addison-Wesley, Advanced Book Program , 1983
 Buku Teks
Kleinau, Karl-Heinz
Telephone installation / Karl-Heinz Kleinau
Edition Leipzig, 1965
 Buku Teks
Goldner, Paul S., author
Red hot cold call selling
American Management Association;, 2006
 eBooks
Boyan, Lee, author
Successful cold call selling
American Management Association, 1989
 eBooks
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