Bright, William (1965). «Review of A history of Palaihnihan phonology by D. L. Olmstead». Baltimore: Linguistic Society of America. Language. 41 (1): 175–178. JSTOR411871. doi:10.2307/411871
Olmstead, David L. (1954). «Achumawi-Atsugewi non-reciprocal intelligibility». Chicago: University of Chicago Press. International Journal of American Linguistics. 20 (3): 181–184. doi:10.1086/464275
jstor.org
Bright, William (1965). «Review of A history of Palaihnihan phonology by D. L. Olmstead». Baltimore: Linguistic Society of America. Language. 41 (1): 175–178. JSTOR411871. doi:10.2307/411871
de Angulo, Jaime; Freeland, L. S. (1930). «The Achumawi Language». International Journal of American Linguistics. 6 (2): 77–120