Caenegem, R.C. van
Guide to the sources of medieval history
North-Holland Publishing, 1978
 Buku Teks SO
Alden, John Richard
A History of the United States
American Book Company, 1960
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Myers, Gustavus
History of bigotry in the United States
Random House, 1943
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Williams, T. Harry
A history of the United States (to 1876)
Alfred A. Knopf, 1963
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Rae, John B.
The United States in World History
McGraw-Hill, 1949
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