Statistical Tools and Techniques/ 
P.K.Giri & J.Banerjee. - 
 - 7th Edition 
 - Kolkata,  Academic Publisher;  2021 
 - 656p. 
<br/><br/><label>ISBN: </label>978-93-87162-79-2  650 
<br/><br/><label>Dewey Class. No.: </label>311.2  / G525