Quechumaran is a language-family proposal that unites Quechua and Aymara. Quechuan languages, especially those of the south, share a large amount of vocabulary with Aymara. Kaufman finds the proposal reasonably convincing, but Willem Adelaar, a Quechua specialist, believes the similarities to be due to borrowing during long-term contact. Lyle Campbell suspects that the proposal is valid, but does not consider it to have been conclusively proven.
- Kaufman, Terrence (1990). "Language History in South America: What we know and how to know more". In David L. Payne. Amazonian Linguistics. Austin: University of Texas Press. pp. 13–74.
- Adelaar, Willem (1992). "Quechuan Languages". In W. Bright. Oxford International Encyclopedia of Linguistics 3. New York, Oxford: Oxford University Press. pp. 303–10.
- Campbell, Lyle (1997). American Indian languages: the historical linguistics of Native America. Oxford: Oxford University Press. pp. 188, 273–283. ISBN 0-19-509427-1.
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