Columbia subject headings:
Church history--Primitive and early church, ca. 30-600.
Church polity--History--Early church, ca. 30-600.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600
Church polity--History--Early church, ca. 30-600.
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600.
Church polity--History--Early church, ca. 30-600.