Furlong, William Barry. <br/><br/>
Horizonte Usa ;   No. 27 

 - Washington-XXU :   U.S. Information Agency,   1978. 
 - p. 60-64 :   il. 
 - Bimestral 
 - No. 27(1978) 
 - Horizonte Usa ;   No. 27 .
 - U.S. Information Agency. .