Haas, Kenneth B., author
Creative salesmanship : understanding essentials
Collier/Macmillan, 1974
 Buku Teks
McDaniel, Carl, author
Marketing essentials
South Western Cengage Learning, 2012
 Buku Teks
Still, Richard R., author
Essentials of marketing
Prentice-Hall, 1966
 Buku Teks
The Direct marketing handbook
Edward L. Nash, editor in chief
McGraw-Hill , 1992
 Buku Referensi
Norris, James S., author
Selling-the how and why : a comprehensive introduction to salesmanship
Prentice-Hall, 1982
 Buku Teks
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