Freeland, G. E., & Adams, J. T. (1941). America and the new frontier. C. Scribner's sons.
Lua i Stíl Chicago (17ú heag.)Freeland, George Earl, agus James Truslow Adams. America and the New Frontier. New York: C. Scribner's sons, 1941.
Lua MLA (9ú heag.)Freeland, George Earl, agus James Truslow Adams. America and the New Frontier. C. Scribner's sons, 1941.
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