Campbell, Howard. <br/><br/>
Tribal synthesis :   Piros, Mansos, and Tiwas through history. 

 - London-ENK :   Board,   2006. 
 - p. 293-311 
 - Trimestral 
 - Vol. 12, no. 2, (Jun.2006) 
 - Journal of the Royal Antropological Institute. Incorporating Man ;   no. 2 .
 - Inglaterra.   Royal Antropological Institute. .
<br/><br/><br/>Art¡culo en inglés.