Gupta , S.P. <br/><br/>
Statistical Methods 

 - New Delhi  Sultan Chand & Sons  1998 
 - E-1.1;R-168;(i)-(Xl- 
<br/><br/><label>ISBN: </label>81-7014-007-2 
<br/><br/><label>Dewey Class. No.: </label>519.5   Gup.N8