Grayson, B. L. (1981). The unknown president: The administration of President Millard Fillmore. University Press of America.
Lua i Stíl Chicago (17ú heag.)Grayson, Benson Lee. The Unknown President: The Administration of President Millard Fillmore. Washington, D.C.: University Press of America, 1981.
Lua MLA (8ú heag.)Grayson, Benson Lee. The Unknown President: The Administration of President Millard Fillmore. University Press of America, 1981.
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