Goldner, Paul S.
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 SO
Lapp, Charles L.
Successful selling strategies : how to climb the ladder to sales succes
McGraw-Hill, 1957
 Buku Teks SO
Allen, Peter
Selling
Pitman, 1998
 Buku Teks SO
Wingate, John W.
Fundamentals of selling
South-Western Publishing, 1959
 Buku Teks SO