Gupta, C B & Gupta, Vijay <br/><br/>
An introduction to statistical methods 

 - 23rd 
 - Vikas publishing house pvt ltd., New Delhi  1973 
 - x,829,xvii 
<br/><br/><label>ISBN: </label>81-259-1654-7 
<br/><br/><label>Dewey Class. No.: </label>311 Gup/Gup