Where are you finding that?
Not sure what "that" is so I'll just post the bibliography of my paper on Tecumseh and his legacy.
Barr, Daniel P., ed.,
The Boundaries Between Us: Natives and Newcomers along the Frontiers of the Old Northwest Territory, 1750-1850. Kent: Kent State University Press, 2006.
Cave, Alfred A.
Prophets of the Great Spirit: Native American Revitalization Movements in Eastern North America (Lincoln: University of Nebraska, 2006.
Edmunds, R. David.
American Indian Leaders: Studies in Diversity. Lincoln: University of Nebraska Press, 1980.
Edmunds, R. David. “Main Poc: Potawatomi Wabeno,”
American Indian Quarterly 9, No. 3 (Summer 1985): 259-272.
Edmunds, R. David.
The Shawnee Prophet. Lincoln: University of Nebraska Press, 1985.
Harrison, William Henry,
Messages and Letters of William Henry Harrison, Volume 1, edited by Logan Esarey. (Indianapolis: Indiana Historical Commission, 1922.
Hughes, Bethany. “The Indispensable Indian: Edwin Forrest, Pushmataha, and
Metamora,”
Theatre Survey 59, Iss. 1 (January 2018): 23-44.
Jefferson, Thomas.
The Papers of Thomas Jefferson, Volume 37, edited by Barbara B. Oberg et al. Princeton: Princeton University Press, 2010.
Jefferson, Thomas.
The Papers of Thomas Jefferson, Volume 38, edited by Barbara B. Oberg et al. Princeton: Princeton University Press, 2011.
Lincecum, Gideon.
Pushmataha: A Choctaw Leader and His People, edited by Greg O’Brien. Tuscaloosa: University of Alabama Press, 2004.
Markowitz, Harvey and Carol A. Barrett, eds.
American Indian Biographies. Pasadena: Salem Press, Inc., 2005.
Mooney, James.
The Ghost-Dance Religion and the Sioux Outbreak of 1890. Lincoln: University of Nebraska Press, 1991.
Mould, Tom, ed.
Choctaw Tales. Jackson: University Press of Mississippi, 2004.
Ruby, Robert H. and John Arthur Brown.
Dreamer-prophets of the Columbian Plateau: Smohalla and Skolaskin. Norman: University of Oklahoma Press, 1989.
Sturgis, Amy H.
Tecumseh: A Biography. Westport: Greenwood Press, 2008.
Thomson, Charles.
An enquiry into the causes of the alienation of the Delaware and Shawanese Indians from the British interest, and into the measures taken for recovering their friendship : extracted from the public treaties, and other authentic papers relating to the transactions of the government of Pensilvania and the said Indians, for near forty years : and explained by a map of the country : together with the remarkable Journal of Christian Frederic Post, by whose negotiations, among the Indians on the Ohio, they were withdrawn from the interest of the French, who thereupon abandoned the fort and country. London: Printed for J. Wilkie, 1759.
United States. President, Quapaw Nation, Choctaw Nation. Treaties, etc. United States, Quapaw Nation. Treaties, etc. United States, United States. Treaties, etc. Choctaw Nation of Indians, and United States. Congress . House.
Message from the President of the United States : transmitting copies of treaties between the United States and the Quapaw and Choctaw Nations of Indians. Washington: Printed by Gales & Seaton, 1825.
Sabin Americana: History of the Americas, 1500-1926 (accessed September 5, 2020).
https://link-gale- com.ezproxy.liberty.edu/apps/doc/CY0110602276/SABN?u=vic_liberty&sid=SABN&xi d=b8838f5a.
Vanderwerth, W.C. and William R. Carmack, ed.,
Indian Oratory: Famous Speeches by Noted Indian Chiefs. Norman: University of Oklahoma Press, 1979.
Wagner, Mark J. “‘He is Worst Than the [Shawnee] Prophet’: The Archaeology of Nativism Among the Early Nineteenth Century Potawatomi of Illinois,”
Midcontinental Journal of Archaeology 31, No. 1 (Spring 2006): 89-116.
Warren, Stephen.
The World the Shawnees Made: Migration and Violence in Early America. Chapel Hill: University of North Carolina Press, 2014.
Wilkins, David E., ed.,
Documents of Native American Political Development: 1500s to 1933. Oxford: Oxford University Press, Inc., 2009.
Wovoka, “The Messiah Letter,” translated by James Mooney.
The West Film Project, 2001. Accessed October 8, 2020.
https://www.pbs.org/weta/thewest/resources/archives/eight/gdmessg.htm
ETA: Amy Sturgis's biography on Tecumseh and R. David Edmunds biography on Tenskwatawa are both excellent reads on the subject of Tecumseh's Pan-Indian movement.