Ariyasinghe.k <br/><br/>
Science 
Ariyasinghe.k 
 -  Sarasavi publishers (Pvt) Ltd  2007 
 - 80 
<br/><br/><label>ISBN: </label>9789555736671 
<br/><br/><label>Dewey Class. No.: </label>507  / Ari