Columbia subject headings:
Canon law--Sources.
Church history--11th century.
Peter Damian, Saint, 1007?-1072.
Harvard subject headings:
Canon law--Sources.
Church history--11th century.
Peter Damian, Saint, 1007?-1072.
Princeton subject headings:
Canon law--Sources.
Church history--11th century.
Peter Damiani, Saint, 1007?-1072.