Jayaweera, Upali. <br/><br/>
Biology :   Work Book - Grade 11. 

 - 1st Ed. 
 - Colombo :   Samudra Book Publications,  2011. 
 - 84 p. 
<br/><br/><label>ISBN: </label>9789556800609 
<br/><br/><label>Dewey Class. No.: </label>574  / JAY