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

 - New Delhi.  Sultan Chand and Sons.  1998 
 - 168 p. 
<br/><br/><label>ISBN: </label>81-7014-007-2 
<br/><br/><label>Dewey Class. No.: </label>519-5   GUP