Columbia subject headings:
Apologetics--Early works to 1800.
Apologetics--History--16th century.
Luther, Martin, 1483-1546.
Reformation--Germany--Sources.
Harvard subject headings:
Catholic Church--Doctrines.
Indulgences--History--16th century--Sources.
Luther, Martin, 1483-1546
Luther, Martin, 1483-1546--Adversaries.
Luther, Martin, 1483-1546--Criticism and interpretation.
Reformation--Germany
Princeton subject headings:
Apologetics--Early works to 1800.
Luther, Martin, 1483-1546.
Reformation--Germany--Sources.