Al rescate. 

 - Washington-XXU :   U.S. Information Agency,   1979. 
 - p. 62-65 
 - Bimestral 
 - No. 32(1979) 
 - Horizonte Usa ;   No. 32 .
 - U.S. Information Agency. .
<br/><br/><br/>Espaņol.