ИСТОЧНИК: “Atlas of the World’s Languages in Danger” . Christopher Moseley (ed.) (2010) UNESCO Publishing

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ИСТОЧНИК: “Ethnologue: Languages of the World, 18th Edition” . , Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig · SIL International

ИСТОЧНИК: “Language endangerment in South America: The clock is ticking” (167-234) . Crevels, Mily (2012) , Lyle Campbell and Veronica Grondona · Mouton de Gruyter

ИСТОЧНИК: “Classification of the indigenous languages of South America” (59-166) . Campbell, Lyle (2012) , Lyle Campbell and Verónica Grondona · Mouton de Gruyter