Hoffman, Ross J.S.
Medieval history
Littlefield, Adams, 1958
 Buku Teks
Cassara, Ernestt
History of the United States of America: a guide to information sources
Gale Research Coompany, 1977
 Buku Teks
Jackson, William Thomas Hobdell
Medieval literature : a history and a guide /​ William Thomas Hobdell Jackson.
Collier, 1966
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Hollister, C. Warren
Medieval Europe : a short history
John Wiley & Sons, 1968
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McGarry, Daniel D.
Outline of medieval history
Littlefield, Adams, 1968
 Buku Teks