Attri, Ajay Kumar. <br/><br/>
Educational Technology / 
By Ajay Kumar Attri. 
 - 1st Ed. 
 - New Delhi :  P H Publishing Corporation,  2017. 
 - 244p. ;  00 cm. 
<br/><br/><label>ISBN: </label>9788176480717 
<br/><br/><label>Dewey Class. No.: </label>371.33  / ATT