Rao, V A Seshagiri <br/><br/>
Step by step classification: a formula based classification vol I 

 - 1st 
 - New Delhi  Ess Ess Publications  2017 
 - xvii,470p p. 
<br/><br/><label>ISBN: </label>9788193359778 
<br/><br/><label>LC Class. No.: </label>2:51  /  Q7.1 
<br/><br/><label>Dewey Class. No.: </label>025.42  / RAO.V.1