ネズパース語
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Aoki, Haruo. (1965). Nez Perce grammar. University of California, Berkeley.
Aoki, Haruo. (1970). Nez Perce grammar. University of California publications in linguistics (Vol. 62). Berkeley: University of California Press. ISBN 0-520-09259-7. (1973年再版、California Library Reprint series).
Missionary in the Society of Jesus in the Rocky Mountains. A Numipu or Nez-Perce grammar. Desmet, Idaho: Indian Boys' Press. https://archive.org/details/cihm_17529 2013年9月21日閲覧。
Aoki, Haruo (1966). “Nez Perce vowel harmony and proto-Sahaptian vowels”. Language 42 (4): 759–767. doi:10.2307/411831. JSTOR 411831.
Aoki, Haruo (1968). “Toward a typology of vowel harmony”. International Journal of American Linguistics 34 (2): 142–145. doi:10.1086/465006.
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Hall, Beatrice L.; & Hall, R. M. R. (1980). Nez Perce vowel harmony: An Africanist explanation and some theoretical consequences. In R. M.
kw、kʼw、qw、qʼw、ʃ音はダウンリバー方言のみで表れる。