Stenton, Doris Mary
Penguin Books, 1952
Buku Teks
Chaunu, Pierre
North-Holland Publishing Co., 1979
Buku Teks
Curtius, Ernst Robert
London Routledge & Kegan Paul [1953]
Buku Teks
De Wulf, Maurice
Dover Publications, Inc., 1922
Buku Teks
Painter, Sidney
Alfred A. Knopf, 1961
Buku Teks