Vocabulario comparativo: Palabras selectas de lenguas indígenas de Colombia. Santafé de Bogotá: ILV.; Bolaños, Katherine & Patience Epps. 2009. Linguistic classification of Kakua, a language of northwest Amazonia. Paper presented at the Conference on Indigenous Languages of Latin America IV, October 29-31, 2009, University of Texas at Austin. (Data obtained via Pieter Muysken and Harald Hammerström).