The Encyclopaedia of educational media communications and technology / 
(editors): Derick Unwin and Ray McAleese 
 - London :  MacMillan,  1978 
 - 800 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0333185501 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology--Dictionaries