Columbia subject headings:
Briefs, Papal--Sources.
Canon law--Sources.
Constitutions.
Councils and synods--Sources.
Harvard subject headings:
Briefs, Papal--Sources.
Canon law--Sources.
Catholic Church--History--Sources.
Councils and synods--Sources.
Legal briefs, Papal--Sources.
Manuscripts, Latin (Medieval and modern)--Facsimiles.
Princeton subject headings:
Briefs, Papal--Sources.
Canon law--Sources.
Councils and synods--Sources.