Ajay Pratap Singh <br/><br/>
DDC 23: A practical approach 
by Ajay Pratap Singh and Mayank Yuvaraj 
 - New Delhi  Today and tomarrow's printers and pub.  2014 
<br/><br/><label>ISBN: </label>9788170194941 
<br/><br/><label>Dewey Class. No.: </label>025.431 AJA/DEW