Dissanayake, Shirani. <br/><br/>
Science :  Model Questions For G.C.E.(O/L) Grade 11 - Part 01. 

 - 1st Ed. 
 - Colombo :  Shirani Dissanayake,  2018. 
<br/><br/><label>ISBN: </label>9789553802590 
<br/><br/><label>Dewey Class. No.: </label>500  / DIS