Steel Robert G.D. and toriett, thomes, H. <br/><br/>
Principels and procedures of statistics 

 - New Delhi  McGraw -Hill  1980 
 - 633p. 
<br/><br/><label>ISBN: </label>0-07-060926-8 
<br/><br/><label>Dewey Class. No.: </label>519.5   Ste.M