Gopalan,  R. & Brindha, M. A. <br/><br/>
Viva general knowledge 

 - Viva education, New Delhi  2005 
 - 32 
<br/><br/><label>ISBN: </label>81-7649-790-8 
<br/><br/><label>Dewey Class. No.: </label>J 001 Gop