Mangal,S K. <br/><br/>
Essentials of educational technology / 
S. K. Mangal and Uma Mangal  
 - New Delhi :  PHI Learning Private Limited,  2009. 
 - xxiii, 812 p. :  ill. ;  28 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9788120337237 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education<br/>Technology
<br/><br/><label>Dewey Class. No.: </label>371.33 MAE