Columbia subject headings:
Apologetics--History--Early church, ca. 30-600.
Marcion, of Sinope, active 2nd century.
Harvard subject headings:
Apologetics--Early works to 1800
Marcion, of Sinope, active 2nd century.
Princeton subject headings:
Apologetics--Early works to 1800.
Apologetics--History--Early church, ca. 30-600.
Marcion, of Sinope, active 2nd century.