Spencer, Charles S. <br/><br/>
Prehispanic causeways and regional politics in the llanos of barinas Venezuela. 

 - Washington, DC-US :   Society for American Archaeology,   1998. 
 - p. 95-110 :   il 
 - trimestral 
 - Vol.9, no.2(Jun.1998) 
 - Latin American Antiquity ;   vol.9, no.2 .
 - Estados Unidos.   Society for American Archaeology. .