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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Myers, Margaret G.
A Financial history of the United States
Columbia University Press , 1970
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Kemmerer, Donald L.
Economic history of the United States
Littlefield, Adams, 1956
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