Key, M. R. (1991). Language change in South American Indian languages. University of Pennsylvania Press.
Chicago Style (17th ed.) CitationKey, Mary Ritchie. Language Change in South American Indian Languages. Philadelphia: University of Pennsylvania Press, 1991.
MLA (9th ed.) CitationKey, Mary Ritchie. Language Change in South American Indian Languages. University of Pennsylvania Press, 1991.
Warning: These citations may not always be 100% accurate.