Johnson, Eugene M. <br/><br/>
Sales management :  concepts, practices, and cases / 
Eugene M. Johnson, David L. Kurtz, Eberhard E. Scheuing. 
 - 2nd ed. 
 - New York :  McGraw-Hill,  c1994. 
 - xxi, 564 p. :  ill. ;  24 cm. 
 - McGraw-Hill series in marketing .