Columbia subject headings:
Apologetics--Early works to 1800.
Apologetics--History--Early church, ca. 30-600.
Christian ethics--Early works to 1800.
Justice--Early works to 1800.
Harvard subject headings:
Apologetics--Early works to 1800
Christian ethics--Early works to 1800
Christian ethics--History--Early church, ca. 30-600
Justice.
Theology, Doctrinal--Early works to 1800.
Princeton subject headings: