PIRIS, G.H. & NELSON, M.D. <br/><br/>
Ganaduraka Sihiwatana 

 -  Colombo :Visidunu Publishers  2010 
 - 306 p. 
<br/><br/><label>ISBN: </label>9789551741396 
<br/><br/><label>Dewey Class. No.: </label>891.483  / P16