Columbia subject headings:
Catholic Church--Middle East--History--Sources.
Middle East--Church history--Sources.
Harvard subject headings:
Catholic Church--Middle East--History--Sources.
Catholic Church--Oriental rites--History--Sources.
Church history--Middle Ages, 600-1500--Sources.
Middle East--Church history--Sources.
Papal documents.
Princeton subject headings:
Bulls, Papal.
Catholic Church--Middle East.
Church history--Middle Ages, 600-1500--Sources.
Papal documents.