Andrews, Anthony, P. <br/><br/>
The fall of chichen itza :   Apreliminary hypothesis. 

 - Washington, DC-US :   Society for American Archaeology,   1990. 
 - p. 258-267 :   il 
 - trimestral 
 - Vol.1, no.3(Sep.1990) 
 - Latin American Antiquity ;   vol.1,no.3 .
 - Estados Unidos.   Society for American Archaeology. .