"Silva, S." <br/><br/>
නියැදි සමීක්ශන/ 
S.Silva 
 - Kottawa:  "Saraa prakaashana,"  1995 
 - 11p. 
<br/><br/><label>Subjects--Index Terms: </label>statsiticssample syrveys 
<br/><br/><label>Dewey Class. No.: </label>301  / SIL