Das R. C. <br/><br/>
Educational technology / 
Das R. C. 
 - New Delhi:  Sterling publisher, 
 - ix, 242p.;22cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>8120715055 
<br/><br/><label>Dewey Class. No.: </label>371.33 DAS