Rao, Usher. <br/><br/>
Educational technology / 
Usha Rao. 
 - New Delhi :  Himalaya,  c1991. 
 - 273 p. 
<br/><br/>Includes bibliography and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio visual Education.
<br/><br/><label>LC Class. No.: </label>LB1028.3  / .R3