Pushpa Dhyani <br/><br/>
Working with DDC (Edition 19 & 20) 
by Pushpa Dhyani 
 - New Delhi  Vikas publishing house  1994 
<br/><br/><label>ISBN: </label>0706976231 
<br/><br/><label>Dewey Class. No.: </label>025.431 PUS/WOR;1