The Nature of educational technology / 
editors, V. K. Rao, R. S. Reddy. 
 - New Delhi :  Ajay Verma,  1992. 
 - viii, 340  p. 
<br/><br/><label>ISBN: </label>8171692281 :  KES 2980 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology.