Rathnapala, N <br/><br/>
Samaja viddyawe muuladarma 

 - Colombo  Lake House Publications  1986 
 - 210 p ., 
<br/><br/> A Book of Principles of Social Science 
<br/><br/><label>ISBN: </label>9555520062 
<br/><br/><label>Dewey Class. No.: </label>300  / RAT