Columbia subject headings:
Archives--Europe--Catalogs.
Knights of Malta--Papal documents--Bibliography.
Templars--Papal documents--Bibliography.
Harvard subject headings:
Archives--Europe--Catalogs.
Europe--Church history--600-1500--Sources.
Knights of Malta--Papal documents--Bibliography.
Templars--Papal documents--Bibliography.
Princeton subject headings:
Archives--Europe--Inventories, calendars, etc.
Knights of Malta--Papal documents--Bibliography.
Templars--Papal documents--Bibliography.