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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Kemmerer, Donald L.
Economic history of the United States
Littlefield, Adams, 1956
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Clark, Victor S.
History of manufactures in the United States
Carnegie Institution of Washington, 1949
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McLaughlin, Andrew C.
A constitutional history of the United States
Appleton Century Crofts, 1935
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