Das,B.C. <br/><br/>
Educational technology 

 - Newdelhi  kalyani  1996 
 - 162p.;  24cm 
<br/><br/><label>ISBN: </label>8170969867 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching aids
<br/><br/><label>Dewey Class. No.: </label>371.33  / DAS