Mangal, S.K. <br/><br/>
Essentials of educational technology / 
S.K. Mangal & Uma Mangal 
 - New Delhi :  PHI Learning,  c2009 
 - xxiv, 812 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9788120337237 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education, Elementary--India<br/>Educational technology--India