APA (7th ed.) Citation

Key, M. R. (1991). Language change in South American Indian languages. University of Pennsylvania Press.

Chicago Style (17th ed.) Citation

Key, Mary Ritchie. Language Change in South American Indian Languages. Philadelphia: University of Pennsylvania Press, 1991.

MLA (9th ed.) Citation

Key, Mary Ritchie. Language Change in South American Indian Languages. University of Pennsylvania Press, 1991.

Warning: These citations may not always be 100% accurate.