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.; Huber, R. Q. & R. B. Reed. 1992. Vocabulario comparativo: Palabras selectas de lenguas indígenas de Colombia. Santafé de Bogotá: ILV. (Data obtained via Pieter Muysken and Harald Hammerström).