Perroy, Edouard, 1901-1974
Le Moyen age l'expansion de l'Orient et la naissance de la civilisation occidentale
Presses Universitaires de France, 1961
 Buku Teks SO
Southern, R.W. (Richard William), 1912-2001
The making of the Middle Ages
Cresset Librar, 1967
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The legacy of the middle ages
edited by C.G. Crump and E.F. Jacob
Clarendon Press, 1951
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Campbell, Kenneth L., 1955-
Western civilization in a global context : the modern age : sources and documents
an imprint of Bloomsbury Publishing Plc, 2015, 2015
 Buku Teks SO
Wood, Charles T.
The age of chivalry : manners and morals 1000-1450 / Charles T. Wood
Universe Books, 1970
 Buku Teks SO