Saxton, Dean. 1982. "Papago." In Studies in Uto-Aztecan grammar 3: Uto-Aztecan grammatical sketches, edited by Ronald W. Langacker. 93-266. 56(3): Summer Institute of Linguistics Publications in Linguistics.
Sawyer, Jesse O. 1980. "The Non-genetic Relationship of Wappo and Yuki." In American Indian and Indoeuropean Studies: Papers in Honor of Madison S.~Beeler, edited by Kathryn Klar et al.. 209-219. Hague: Mouton de Gruyter.
Sapir, Edward and Harry Hoijer. 1967. "The Phonology and Morphology of the Navaho Language." 50: Berkeley and Los Angeles: University of California Press.
Sapir, Edward. 1907. "Preliminary Report On the Language and Mythology of the Upper Chinook." In American Anthropologist, 9 , no. 3: 533-544.