Spence, Michael W. <br/><br/>
Commodity or gift :   Teotihuacan obsidian in the maya region. 

 - Washington, DC-US :   Society for American Archaeology,   1996. 
 - p. 21-39 :   il 
 - trimestral 
 - Vol.7, no.1(Mar.1996) 
 - Latin American Antiquity ;   vol.7, no.1 .
 - Estados Unidos.   Society for American Archaeology. .