Columbia subject headings:
Civilization, Classical.
Civilization, Medieval.
Religion--History.
Szövérffy, Joseph, 1920-2001.
Harvard subject headings:
Civilization, Medieval.
Hymns--History and criticism
Szövérffy, Joseph, 1920-2001--Bibliography.
Princeton subject headings:
Civilization, Classical.
Civilization, Medieval.
Middle Ages.
Szövérffy, Joseph, 1920-2001.