Ralapanawa, Mahinda <br/><br/>
Copyright and it's economic importance 
Mahinda Ralapanawa 
 - Colombo  Sri Lanka national library service board  1990 
 - 208 - 211 p.  pbk. ;  24 cm 
<br/><br/><label>Dewey Class. No.: </label>027.5  / SRI