Martin Ridge. The Life of an Idea:The Significance of Frederick Jackson Turner's Frontier Thesis. Montana: The Magazine of Western History, Vol. 41, No. 1 (Winter, 1991), p. 4. Published by: Montana Historical Society. Article Stable URL: https://www.jstor.org/stable/4519357Arxivat 2024-03-28 a Wayback Machine..
Allan G. Bogue, "Frederick Jackson Turner Reconsidered,The History Teacher, (1994), p. 195. in JSTOR.
Robert H. Block. "Frederick Jackson Turner And American Geography." Annals of the Association of American Geographers. Published by: Taylor & Francis, Ltd. on behalf of the Association of American Geographers. Vol. 70, No.1 (Mar., 1980), p. 40. Article Stable URL: https://www.jstor.org/stable/2562823Arxivat 2024-08-31 a Wayback Machine..
Wilbur R. Jacobs. "Wider Frontiers: Questions of War and Conflict in American History: The Strange Solution by Frederick Jackson Turner". California Historical Society Quarterly, vol. 47, no. 3 (Sep. 1968), p. 230. Article Stable URL: https://www.jstor.org/stable/25154299.
«Còpia arxivada». Portage Daily Register, 16-03-1932. Arxivat de l'original el 2022-05-26 [Consulta: 9 setembre 2024].
Martin Ridge. The Life of an Idea:The Significance of Frederick Jackson Turner's Frontier Thesis. Montana: The Magazine of Western History, Vol. 41, No. 1 (Winter, 1991), p. 4. Published by: Montana Historical Society. Article Stable URL: https://www.jstor.org/stable/4519357Arxivat 2024-03-28 a Wayback Machine..
Robert H. Block. "Frederick Jackson Turner And American Geography." Annals of the Association of American Geographers. Published by: Taylor & Francis, Ltd. on behalf of the Association of American Geographers. Vol. 70, No.1 (Mar., 1980), p. 40. Article Stable URL: https://www.jstor.org/stable/2562823Arxivat 2024-08-31 a Wayback Machine..