Phelps, D.M.
Sales management policies and procedures/ D.M. Phelps
Richard D. Irwin , 1953
 Buku Teks
Phelps, D.M.
Planning the product/ D.M. Phelps
Ill. Richard D. Irwin, Inc , 1947
 Buku Teks
Stone, Bob, author
Successful telemarketing : opportunities and techniques for increasing sales and profits/ Bob Stone and John Wyman
Prentice-Hall, 1986
 Buku Teks
Sugars, Bradley J., author
Instant sales
McGraw-HIll , 2006
 Buku Teks
Johnson, Spencer, author
The one minute sales person
Harper Collins, 2004
 Buku Teks
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