Aspects of Hopi grammar. MIT, dissertation. 1978. Voegelin, Charles F. Tübatulabal Grammar. University of California Publications in American Archaeology
平原印第安人手语(英語:Plains Indian Sign Language,PISL;法語:Langue des Signes Indienne des Plaines;西班牙語:Lenguaje de Signos Indio de las Llanuras),又称平原手语、平原手势谈话(Plains
endonyms; The language in question is actually a language family; The language or community of speakers has a prohibition against writing the language; No documentation
[2009-05-16]. (原始内容存档于2012-10-15). Lakota Language Consortium. [2016-07-28]. (原始内容存档于2011-05-01). About the Lakota Language Program. Red Cloud Indian School.
dissertation. Leiden, 1921 Hanks. A Psychological Exploration in the Blackfoot Language. International Journal of American Linguistics. 1954, 20 (3): 195–205.