KOCH,R. <br/><br/>
The 80/20 Principle: The Secret of Achieving More with Less 

 -  USA,Crown Publishing Group  2008 
 - 269 p. 
<br/><br/><label>ISBN: </label>9780385491747 
<br/><br/><label>Dewey Class. No.: </label>650.1  / K51