Hoffman, Ross J.S.
Medieval history
Littlefield, Adams, 1958
 Buku Teks SO
Medieval philosophy : essential readings with commentary
Gyula Klima, Fritz Allhoff, Anand Vaidya
BlackWell Publishing, 2007
 Buku Teks SO
Rickard, J.A.
Ancient, medieval & modern history
Barnes & Noble, 1952
 Buku Teks SO
Hollister, C. Warren
Medieval Europe : a short history
John Wiley & Sons, 1968
 Buku Teks SO
Caenegem, R.C. van
Guide to the sources of medieval history
North-Holland Publishing, 1978
 Buku Teks SO