Keck, Robert W
Biomath: Problem solving for Biology students/Robert W. Keck dan Richard R. Patterson
Addison Wesley Longman , 2000
 Buku Teks
Speidel, Richard E., author
Sales and leases of goods
St. Paul, Minn, 1993
 Buku Teks
Stockton, John M., author
Sales and Leases of Goods in a Nutshell
West Publishing, 1992
 Buku Teks
Barry, John W., author
Efective sales incentive compensation
McGraw-Hill, 1981
 Buku Teks
Stanton, William J., author
Management of the sales force
Richard D. Irwin, 1978
 Buku Teks
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