Gupta ,  S. P. & Gupta P.K. <br/><br/>
Business Statistics 

 - New Delhi  Sultan Chand & Sons  2009 
 - BS.1-2 , BM-Q-4p. 
<br/><br/><label>ISBN: </label>81-8054-605-1 
<br/><br/><label>Dewey Class. No.: </label>519    Gup.P9