"Alahakoon, Uditha" <br/><br/>
DDC 23 Dewey decimal classification / 
Uditha Alahakoon 
 - Gampaha:  "Nine Publishing,"  2017 
 - 379 p. 
<br/><br/><label>ISBN: </label>9.78956E+12 
<br/><br/><label>Dewey Class. No.: </label>20  / ALA