Bhatt, B D & Prakash, Ravi <br/><br/>
Modern encyclopaedia of educational technology 

 - Kanishka Publishers, New Delhi  1994 
 - v,243 
<br/><br/><label>ISBN: </label>81-7391-027-8 
<br/><br/><label>Dewey Class. No.: </label>R371.335 Bha/Pra