The nature of educational technology / 
V.K Rao. 
 - New Delhi :  Commonwealth,  c1992. 
 - 340 p. 
<br/><br/><label>ISBN: </label>8171692281 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education.
<br/><br/><label>LC Class. No.: </label>LB1028.3  / .R3