CAMPBELL, Lyle (1997): American Indian Languages. The Historical Linguistics of Native America. Oxford: Oxford University Press.10.1093/oso/9780195094275.001.0001
FOWLER, Catherine (1972): Some Ecological Clues to Proto-Numic Homelands. In Don Fowler (ed.): Great Basin Cultural Ecology. A Symposium. Reno: University of Nevada, pp. 105-121.
FOWLER, Don – FOWLER, Catherine (eds.) (1971): Anthropology of the Numa. John Wesley Powell’s Manuscripts on the Numic Peoples of Western North America, 1868-1880. Washington: Smithsonian Institution.10.5479/si.00810223.14.1
HARRISON, David (2007): When Languages Die. The Extinction of the World’s Languages and the Erosion of Human Knowledge. Oxford: Oxford University Press.
HINTON, Leanne (2008): Sleeping Languages. Can They Be Awakened? In Leanne Hinton, Ken Hale (eds.): The Green Book of Language Revitalization in Practice. Bingley: Emerald, pp. 413-418.10.1016/B978-012349353-8/50048-0
KRAUSS, Michael (1996): Status of Native American Language Endangerment. In Gina Cantoni (ed.): Stabilizing Indigenous Languages. Flagstaff: Northern Arizona University, pp. 15-20.
MILLER, Wick (1996): Sketch of Shoshone, a Uto-Aztecan Language. In Ives Goddard (ed.): Handbook of North American Indians 17. Languages. Washington: Smithsonian Institution, pp. 693-720.
NETTLE, Daniel – ROMAINE, Suzanne (2000): Vanishing Voices. The Extinction of World's Languages. Oxford: Oxford University Press.10.1093/oso/9780195136241.001.0001
SHREVE, Bradley (ed.) (2019): Language Revitalization at Tribal Colleges and Universities. Overviews, Perspectives, and Profiles 1993-2018. Mancos: Tribal College Press.