Columbia subject headings:
Bibliographical citations.
Civilization, Medieval--Bibliography.
Civilization, Medieval--Research.
Middle Ages--Research.
Harvard subject headings:
Bibliographical citations.
Civilization, Medieval--Bibliography.
Civilization, Medieval--Research.
Middle Ages--Research.
Princeton subject headings:
Bibliographical citations.
Civilization, Medieval--Bibliography.
Civilization, Medieval--Sources.
Civilization, Medieval--Study and teaching.