Aron, Stephen, "The Making of the First American West and the Unmaking of Other Realms" in William Deverell, επιμ. (2007). A Companion to the American West. Wiley-Blackwell. σελίδες 5–24. ISBN978-1405156530.
John T. Juricek, "American Usage of the Word 'Frontier' from Colonial Times to Frederick Jackson Turner", Proceedings of the American Philosophical Society (1966) 110#1 pp. 10–34 in JSTOR
Kerwin Lee Klein, "Reclaiming the 'F' Word, or Being and Becoming Postwestern", Pacific Historical Review (1996) 65#2 pp. 179–215 in JSTOR.