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
Allen, Peter
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
Wingate, John W.
Fundamentals of selling
South-Western Publishing, 1959
Buku Teks