D.M.A.Devasinghe <br/><br/>
Science  Gr 11  
D.M.A.Devasinghe 
 - Sri Lanka  Samudra Book Publications   2011 
 - 70 
<br/><br/><label>ISBN: </label>9789556800456 
<br/><br/><label>Dewey Class. No.: </label>500  / DEV