Campbell, Lyle. 1979. Middle American languages. In The Languages of Native America: Historical and Comparative Assessment, edited by Lyle Campbell and Marianne Mithun, pp. 902—1000. University of Texas Press, Austin.
Campbell, Lyle. 1997. American Indian Languages: The Historical Linguistics of Native America. Oxford University Press.
Goddard, Ives. 1996. Introduction. In Languages, edited by Ives Goddard, pp. 1-16. Handbook of North American Indians, William C. Sturtevant, general editor, Vol. 17. Smithsonian Institution, Washington, D.C.
Goddard, Ives. 1999. «Native Languages and Language Families of North America.» Wall Map. Lincoln, Nebraska: University of Nebraska Press.
Miller, Wick R. 1983. Uto-Aztecan languages. In Southwest, edited by Alfonso Ortiz, pp. 113—124. Handbook of North American Indians. William C. Sturtevant, general editor, Vol. 10. Smithsonian Institution, Washington, D. C.
Steele, Susan. 1979. Uto-Aztecan: An assessment for historical and comparative linguistics. In The Languages of Native America: Historical and Comparative Assessment, edited by Lyle Campbell and Marianne Mithun, pp. 444—544. University of Texas Press, Austin.
Súarez, Jorge. 1983. The Mesoamerican Indian Languages. Cambridge University Press.