Columbia subject headings:
Bible. Psalms--Criticism, interpretation, etc.--History--16th century.
Luther, Martin, 1483-1546.
Prayer--History--16th century.
Theology of prayer.
Harvard subject headings:
Bible. Psalms--Criticism, interpretation, etc.--History--16th century.
Luther, Martin, 1483-1546--Contributions in theology of prayer.
Prayer
Princeton subject headings: