Rathnapala, N <br/><br/>
Samaja viddya paryeshana muuladarma 

 - 2nd 
 - Varakapola  Arya Publishers  1987 
 - 231 p ., 
<br/><br/><label>ISBN: </label>9555530025 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social Science<br/>Research
<br/><br/><label>Dewey Class. No.: </label>300.72  / RAT