Mangal, S.K <br/><br/>
Essentials of educational technology / 
S K Mangal, Uma Mangal 
 - New Delhi :  PHI ,  2011. 
 - xxiv, 812 p. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9788120337237 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology
<br/><br/><label>LC Class. No.: </label>LB1028.3.M36 2011