"Karuk Indians."SDSU: California Indians and Their Reservations. 30 July 2013.
unesco.org
unesdoc.unesco.org
Rogers, Chris; Palossari, Naomi; Campbell, Lyle (2010). "United States of America". In Christopher Moseley (ed.). Atlas of the World's Languages in Danger (3rd ed.). UNESCO. pp. 108–112. ISBN9789231040962. Retrieved 5 January 2022.