Bates Graber, Robert. <br/><br/>
Population pressure, agricultural orins, and cultural evolution :   Constrained mobility or inhibited expansion?. 

 - Washington, DC :   American Anthropological Association,   1991. 
 - p. 692-695 
 - trimestral 
 - Vol.93, no.3(Sep.1991) 
 - American Anthropologist ;   vol.93, no.3 .
 - Estados Unidos.   American Anthropological Association. .
<br/><br/> Articulo dentro de commentaries.