Chico (also Valley Maidu) is an extinct
Maiduan language formerly spoken by
Maidu peoples who lived in Northern California, between Sacramento and the Sierra foothills.
Campbell, Lyle. (1997). American Indian languages: The historical linguistics of Native America. New York: Oxford University Press.
ISBN978-0-19-509427-5.
Heizer, Robert F. (1966). Languages, territories, and names of California Indian tribes.