Columbia subject headings:
Luther, Martin, 1483-1546--Language.
Zwingli, Ulrich, 1484-1531--Language.
Harvard subject headings:
Luther, Martin, 1483-1546--Language.
Zwingli, Ulrich, 1484-1531--Language.
Princeton subject headings:
Luther, Martin, 1483-1546--Language.
Zwingli, Ulrich, 1484-1531--Language.