Columbia subject headings:
Church history--Middle Ages, 600-1500.
Smet, J. M. de (Jozef-Maria), 1916-
Harvard subject headings:
Church history--Middle Ages, 600-1500
Smet, J. M. de (Jozef-Maria), 1916-
Princeton subject headings:
Church history--Middle Ages, 600-1500.
Middle Ages.
Smet, J.M. de (Jozef-Maria de)