Gupta, S. P. and Gupta, Archana <br/><br/>
Statistical methods  Statistical methods._5th rev. Ed, New Delhi : Sultan Chand & Sons, 2004 
S. P. Gupta and Archana Gupta 
 - 5th rev. 
 - New Delhi  Sultan Chand & Sons  2004 
<br/><br/><label>Dewey Class. No.: </label>311