Columbia subject headings:
Constitutions.
Councils and synods.
Ecclesiastical law.
Harvard subject headings:
Canon law--Sources.
Church history--Primitive and early church, ca. 30-600--Sources.
Councils and synods, Ecumenical--History--Sources.
Councils and synods.
Creeds, Ecumenical.
Ecclesiastical law--Sources.
Ecclesiastical law.
Princeton subject headings: