Behrena, Clifford A. <br/><br/>
The scientific basis for shipibo soil classification and land use :   Changes in soil-plant associations with cash cropping. 

 - Washington, DC :   American Anthropological Association,   1989. 
 - p. 83-100 :   il 
 - trimestral 
 - Vol.91, no.1(Mar.1989) 
 - American Anthropologist ;   vol.91, no.1 .
 - Estados Unidos.   American Anthropological Association. .