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