Kesavan Nair P <br/><br/>
Prapancham  science 

 - 2nd Ed. 
 - Kottayam  Current books  2008 
 - 223 
<br/><br/><label>ISBN: </label>8124015694 
<br/><br/><label>Dewey Class. No.: </label>MIS  / KES/PR