Rao, V.K., Reddy R.S. (ed) <br/><br/>
The nature of educational technology 

 - Commonwealth Publishers, New Delhi  1992 
 - viii, 340 
<br/><br/><label>ISBN: </label>81-7169-228-1 
<br/><br/><label>Dewey Class. No.: </label>371.3 Rao/Red