Mangal, S. K.,  1940- <br/><br/>
Essentials of educational technology / 
S.K. Mangal. 
 - New Delhi :  PHI Learning Pvt. Ltd.,  2011. 
 - xxiv, 812 p. :  ill. ;  24 cm. 
<br/><br/> Third printing September 2011. 
<br/><br/><label>ISBN: </label>9788120337237 (hbk.)  RM71.90 8120337239 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education, Elementary--Computer-assisted instruction.--India<br/>Educational technology--India.