Contributions to an education technology / 
edited by Ivor K. Davies, James Hartley 
 - London :  Butterworths,  1972 
 - 294 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0408701382 
<br/><br/><label>LCCN: </label>72-190809 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology