Koch, Richard. <br/><br/>
The 80/20 principle :  the secret to achieving more with less. 

 - New York :  Currency,  2017. 
 - 319 p. 
<br/><br/><label>ISBN: </label>9780385491747  18 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conduct of life.<br/>Industrial efficiency.<br/>Time management.
<br/><br/><label>Dewey Class. No.: </label>650.1  / KOC-e