Thompson, Willard M.
The basics of successful salesmanship a self-teaching programed book / Willard M. Thompson
McGraw-Hill , 1968
 Buku Teks
Fernandez, Judi N., 1941-, author
Using CP/m: a self-teaching guide
John Wiley & Sons, 1980
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Tagliaferri, Louise E.
Successful supervision : a self-teaching guide / Louise E. Tagliaferri and Janan Talafer
John Wiley & Sons, 1979
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Ivey, Paul W.
Successful salesmanship / by Paul W. Ivey, Walter Horvath
Prentice-Hall, 1961
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Jenks, Ernest E., author
Salesmanship
Alexander hamilton Institute, 1962
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