CONOVER, W.J. <br/><br/>
Practical nonparametric statistics 

 - 2ND 
 - New york  John wiley & sons  1980 
 - xiv, 493p. 
<br/><br/><label>ISBN: </label>471028673 
<br/><br/><label>Dewey Class. No.: </label>519.53