Giles, Frank <br/><br/>
Obstructions to the free flow information / 
Frank Giles. 
 - Paris :  UNESCO,  1978. 
 - 36 p. 
 - International Commission for the Study of Communication Pro- .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>070.13 (100) =20 GIL No.52.