Springmann, Christopher. <br/><br/>
Ruda monta en el rodeo. 

 - Washington-XXU :   U.S. Information Agency,   1976. 
 - p. 50-55 
 - Bimestral 
 - No. 17(1976) 
 - Horizonte Usa ;   No. 17 .
 - U.S. Information Agency. .
<br/><br/><br/>Espaņol.