Cyr, Donald. <br/><br/>
Marketing your product /​ Donald Cyr, Douglas Gray. 

 - 5th ed. 
 - Petaling Jaya :  Advantage Quest,  1987. 
 - xx, 164 p. ;  25 cm 
<br/><br/> includes index 
<br/><br/><label>ISBN: </label>9833831036