Nance, Roger. <br/><br/>
Obsidian blades fromlablanca, a changing lithic industry on the south coast of Guatemala. 

 - Washington, DC-US :   Society for American Archaeology,   1991. 
 - p. 371-383 :   il 
 - trimestral 
 - Vol.2, no.4(Dec.1991) 
 - Latin American Antiquity ;   vol.2,no.4 .
 - Estados Unidos.   Society for American Archaeology. .