Beard, C. A., & Beard, M. R. (1944). A basic history of the United States. New York: New Home Library.
Lua i Stíl Chicago (17ú heag.)Beard, Charles A., agus Mary R. Beard. A Basic History of the United States. New York: New Home Library, 1944.
Lua MLA (8ú heag.)Beard, Charles A., agus Mary R. Beard. A Basic History of the United States. New York: New Home Library, 1944.
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