Tanaka, Akihiko, author
The new Middle Ages: the world system in the 21st Century
International House of Japan, 2002
 Buku Teks
The Middle ages : an encyclopedia for students volume 1-4
editor, William Chester Jordan
Charles Scribner's Sons, 1996
 Buku Referensi
Newhauser, Richard
Sin: essays on the moral tradition in the Western middle ages
Ashgate/Variorum, 2007
 Buku Teks
Stenton, Doris Mary
English society in the early middle ages (1066-1307)
Penguin Books, 1952
 Buku Teks
De Wulf, Maurice
Philosophy and civilization in the middle ages / Maurice de Wulf.
Dover Publications, Inc., 1922
 Buku Teks
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