Natoti Vijnanam  Malayalam 
Vishnu Namboothiri M V 
 - 4th 
 - Kozhikode  D C Books  2007 
 - 332 
<br/><br/><label>ISBN: </label>8171306764 
<br/><br/><label>Dewey Class. No.: </label>894.812 VIS  / 13217