Columbia subject headings:
Apologetics--Early works to 1800.
Apologetics--History--Early church, ca. 30-600.
Christianity--Philosophy--History.
Church history--Primitive and early church, ca. 30-600.
Harvard subject headings:
Apologetics--Early works to 1800
Apologetics--History--Early church, ca. 30-600
Christianity--Philosophy--History
Church history--Primitive and early church, ca. 30-600
Church history--Primitive and early church, ca. 30-600.
Princeton subject headings: