Columbia subject headings:
Naumann, Friedrich, 1860-1919.
Weber, Max, 1864-1920.
Harvard subject headings:
Liberalism--Germany
Naumann, Friedrich, 1860-1919.
Weber, Max, 1864-1920--Influence.
Princeton subject headings:
Christian socialism--Germany--History.
Naumann, Friedrich, 1860-1919.
Weber, Max, 1864-1920.