Whiting, Percy H. <br/><br/>
The 5 great rules of selling / 
Percy H. Whiting. 
 - Rev. ed. 
 - New York :  McGraw-Hill Book Company, Inc.,  c1957. 
 - xi, 340 p. ;  22 cm. 
<br/><br/> Includes Index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Selling.