Spencer, Ken. <br/><br/>
The Psychology of educational technology and instructional media 
Ken. Spencer 
 - 2nd ed. 
 - London  Routledge  1991 
 - 211p. 
<br/><br/><label>ISBN: </label>1873534000 
<br/><br/><label>Dewey Class. No.: </label>371.3078019 Sp33p -2