V.Malhotra <br/><br/>
First Encyclopedia 

 - 4598/12-B Ansari Road Darya Ganji New Delhi-110002  SPK Graphs  2015 
 - 31p. 
<br/><br/><label>ISBN: </label>9788171874339 
<br/><br/><label>Dewey Class. No.: </label>32MAL