The Encyclopaedia of educational media communications and technology / 
Derick Unwin and Ray McAleese 
 - Westport, Conn. :  Greenwood Press,  1979 
 - 800 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0313209219 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio--visual materials--Dictionaries<br/>Educational technology--Dictionaries