The Middle ages : an encyclopedia for students volume 1-4
editor, William Chester Jordan
Charles Scribner's Sons, 1996
 Buku Referensi
Easton, Stewart C., author
The heritage of the past : from the earliest times to the close of the middle ages
Holt, Rinehart and Winston, 1955
 Buku Teks
Simons, Gerald.
The birth of Europe / by Gerald Simons and the editors of Time-Life Books.
Time-Life Internationa, 1968
 Buku Teks
The legacy of the middle ages
edited by C.G. Crump and E.F. Jacob
Clarendon Press, 1951
 Buku Teks
Mott, George Fox
Middle ages : an outline-history from the decline of the roman empire through the reformation / George Fox Mott, Harold M. Dee
Barnes & Noble, Inc., 1957
 Buku Teks
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