Díaz Encinas, A.I. and Meza Arquíñigo, C. 2015. Sociological, demographic and economic study of the Indigenous communities in the Ucayali Region: 1993-2007. Investigaciones Sociales. 18, 33 (Feb. 2015), 187–199. DOI:https://doi.org/10.15381/is.v18i33.10993.