Gopala Pillai S <br/><br/>
Yogaratna samuchayam 

 - 6th 
 - Alappuzha  Vidyarambham publishers  1999 
 - 280 
<br/><br/><label>ISBN: </label>8185973067 
<br/><br/><label>Dewey Class. No.: </label>610.01  / GOP/YO