Boyan, Lee, author
Successful cold call selling
American Management Association, 1989
 eBooks
Goldner, Paul S., author
Red hot cold call selling
American Management Association;, 2006
 eBooks
Stone, Bob
Successful telemarketing : opportunities and techniques for increasing sales and profits/ Bob Stone and John Wyman
Prentice-Hall, 1986
 Buku Teks
Allen, Peter, author
Selling
Pitman, 1998
 Buku Teks
Lapp, Charles L.
Successful selling strategies : how to climb the ladder to sales succes / Charles L. Lapp
McGraw-Hill, 1957
 Buku Teks
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