Hawkridge, David. <br/><br/>
Organizing educational broadcasting / 
David Hawkridge; John Robinson. 
 - Paris :  UNESCO,  1982. 
 - 302 p. ;  il. 
<br/><br/><label>ISBN: </label>9233018787. 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.684/ .687 =20 HAW.