Zikmund, William G.  <br/><br/>
Business research methods  
William G. Zikmund.  
 - 4th ed. 
<br/><br/><label>ISBN: </label>9780030975851 
<br/><br/><label>LC Class. No.: </label>HD30.4 Z54 1994  / HD30.4 Z54 1994