gives some examples: Grammatical differences Yankton-Yanktonai has the same three ablaut grades as Lakota (a, e, iŋ), while in Santee-Sisseton there are only two (a, e). This significantly impacts word forms, especially in fast speech and it is another reason why Yankton-Yanktonai has better mutual intelligibility with Lakota than with Santee-Sisseton. Some examples: There are other grammatical differences between the dialects. Revitalization efforts and resources Software and mobile apps for learning Dakhóta A Dakota 1 app was previously available for iPhone, iPad, and other iOS devices. The Association on American Indian Affairs website offers an extensive selection of Dakotah learning resources, including CDs, DVDs, flashcards, and software. Curriculum, textbooks, and other materials for teaching and learning Dakhóta A Level 1 Speak Dakota! textbook is available from the Dakhóta Iápi Okhódakičhiye. Developed by Dakota language speakers, teachers, and linguists, the textbook is the first fully illustrated Dakota language textbook that is linguistically and pedagogically consistent. Dakota language learning materials are also available on their website. References Bibliography DeMallie, Raymond J. (2001). Sioux until 1850. In R. J. DeMallie (Ed.), Handbook of North American Indians: Plains (Vol. 13, Part 2, pp. 718–760). W. C. Sturtevant (Gen. Ed.). Washington, D.C.: Smithsonian Institution. . Parks, Douglas R.; & Rankin, Robert L. (2001). The Siouan languages. In Handbook of North American Indians: Plains (Vol. 13, Part 1, pp. 94–114). Washington, D.C.: Smithsonian Institution. de Reuse, Willem J. (1987). One hundred years of Lakota linguistics (1887–1987). Kansas Working Papers in Linguistics, 12, 13-42. de Reuse, Willem J. (1990). A supplementary bibliography of Lakota languages and linguistics (1887–1990). Kansas Working Papers in Linguistics, 15 (2), 146-165. (Studies in Native American languages 6). Rood, David S.; & Taylor, Allan R. (1996). Sketch of Lakhota, a Siouan language. In Handbook of North American Indians: Languages (Vol. 17, pp. 440–482). Washington DC: Smithsonian Institution. Riggs, S.R., & Dorsey, J.O. (Ed.). (1973). Dakota grammar, texts, and ethnography. Minneapolis: Ross & Haines, Inc. Shaw, P.A. (1980). Theoretical issues in Dakota phonology and morphology. New York: Garland Publishing, Inc. External links Dakota Language Texts, from the Boston Athenæum: Schoolcraft Collection of Books in Native American Languages. Digital Collection. Dakota culture Native American language revitalization Western Siouan languages Indigenous languages of Minnesota