Kirkpatrick, Charles A., author
Salesmanship : helping prospects buy
South-Western Publishing Company, 1966
 Buku Teks
Prospects
Paris : The United Nations Educational
 Majalah, Jurnal, Buletin
Gookin, Dan
Buy that computer! / Dan Gookin
IDG Books, 1995
 Buku Teks
Sandler, Corey, author
Buy more pay less
Prentice-Hall, 2001
 Buku Teks
Mancuso, Joseph, author
How to buy and manage a Franchise
Simon & Schuster , 1993
 Buku Teks
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