Phelps, D.M.
Planning the product/ D.M. Phelps
Richard D. Irwin, 1947
 Buku Teks SO
Stone, Bob
Successful telemarketing : opportunities and techniques for increasing sales and profits/ Bob Stone and John Wyman
Prentice-Hall, 1986
 Buku Teks SO
Sugars, Bradley J.
Instant sales
McGraw-Hill, 2006
 Buku Teks SO
Johnson, Spencer
The one minute sales person
HarperCollins, 2004
 Buku Teks SO
Gamble, Teri Kwal
Sales scripts that sell
American Society for Training & Development, 2007
 eBooks