Columbia subject headings:
Christian ethics--History--Middle Ages, 600-1500.
Faith and reason--Christianity--History of doctrines--Middle Ages, 600-1500.
Harvard subject headings:
Christian ethics--History--Middle Ages, 600-1500
Faith and reason--Christianity--History of doctrines--Middle Ages, 600-1500.
Princeton subject headings:
Christian ethics--History--Middle Ages, 600-1500.
Faith and reason--Christianity--History of doctrines--Middle Ages, 600-1500.