Contributions to an educational technology / 
edited by Ivor K. Davies, James Hartley 
 - London :  Butterworths,  c1972 
 - 294 p. :  ill., facsims. ;  22 cm. 
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>ISBN: </label>0408701382 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology
<br/><br/><label>Dewey Class. No.: </label>371.3078