The Website Services & Coordination Staff, US Census Bureau: Following the Frontier Line, 1790 to 1890 (amerikai angol nyelven). U.S. Census . (Hozzáférés: 2020. február 1.)
Juricek, John T. (1966). „American Usage of the Word "Frontier" from Colonial Times to Frederick Jackson Turner”. Proceedings of the American Philosophical Society110 (1), 10–34. o. ISSN0003-049X. JSTOR985999.
(1996) „Reclaiming the "F" Word, or Being and Becoming Postwestern”. Pacific Historical Review65 (2), 179–215. o. DOI:10.2307/3639983. JSTOR3639983.
Juricek, John T. (1966). „American Usage of the Word "Frontier" from Colonial Times to Frederick Jackson Turner”. Proceedings of the American Philosophical Society110 (1), 10–34. o. ISSN0003-049X. JSTOR985999.