Columbia subject headings:
Harvard subject headings:
Canon law--Sources.
Collectio Britannica.
Council of Melfi (1089)
Urban II, Pope, approximately 1042-1099.
Princeton subject headings:
Canon law--History--Sources.
Catholic Church. Pope (1088-1099 : Urban II)
Collectio Britannica.
Council of Melfi (1089)
Papacy--History--To 1309.