Mangal, S. K. <br/><br/>
Essentials of educational technology 
S. K. Mangal and Uma Mangal 
 - New Delhi  PHI Learning  2011 
 - xxiv,812p.;   24cm. 
<br/><br/><label>ISBN: </label>978-81-203-3723-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology<br/>Education--Technological innovations
<br/><br/><label>Dewey Class. No.: </label>371.33   / MAN