ඉගෙනීම සිදු වන්නේ කෙසේද? 

 -  NIE,  1986 
 - 36p;  ill.;  28cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Professional Education
<br/><br/><label>Index Terms--Curriculum Objective: </label><br/>Distance Education