Anderson, Kristin
Great customer service on the telephone
American Management Association, 1992
 eBooks
Telephone surveys in Europe: research and practice
edited by Sabine Hader, Michael Hader and Mike Kuhne
Springer, 2012
 eBooks
Briley, Bruce E.
Introduction to telephone switching / Bruce E. Briley
Addison-Wesley, Advanced Book Program , 1983
 Buku Teks
Roman, Murray
Telephone marketing
McGraw-Hill, 1976
 Buku Teks SO
William, Miller
Knock your socks off prospecting: how to cold call, get qualified leads, and make more money
American Management Association, 2005
 eBooks