Columbia subject headings:
Harvard subject headings:
Catholic Church. Poenitentiaria Apostolica--History--Sources.
Christianity and other religions--Islam--Sources.
Christianity and other religions--Judaism--Sources.
Islam--Relations--Christianity--Sources.
Judaism--Relations--Christianity--Sources.
Religious biography--Sources.
Princeton subject headings:
Antisemitism--Italy--History--Sources.
Catholic Church--Relations--Islam--History--Sources.
Catholic Church--Relations--Judaism--History--Sources.
Catholic Church. Poenitentiaria Apostolica--History--Sources.
Islam--Relations--Christianity--History--Sources.
Jews--Mediterranean Region--History--Sources.
Judaism--Relations--Catholic Church--History--Sources.
Muslims--Mediterranean Region--History--Sources.