NAIR,PMC <br/><br/>
Vyavasayika Surakshitattvavum Pankalittavum 

 - 1st Ed. 
 -  State Institute Of Language Thiruvananthapuram,  1999 
 - 162P 
<br/><br/><label>ISBN: </label>81-7638068-7 
<br/><br/><label>Dewey Class. No.: </label>658  / NAI/V