Columbia subject headings:
Apologetics--Early works to 1800.
Apologetics--History--Early church, ca. 30-600.
Christianity and culture--History--Early church, ca. 30-600.
Church and the world.
History--Religious aspects--Christianity--History of doctrines.
Harvard subject headings:
Apologetics--Early works to 1800
Christianity and culture--History--Early church, ca. 30-600.
Church history--Primitive and early church, ca. 30-600
Philosophy and religion.
Religion--History
Princeton subject headings:
Apologetics--History--Early church, ca. 30-600.
Christianity and culture--History--Early church, ca. 30-600.
Church and the world.
History--Religious aspects--Christianity--History of doctrines.