Columbia subject headings:
Harvard subject headings:
Simmel, Georg, 1858-1918. Soziologie--Congresses.
Sociology--Congresses
Sociology--Germany--History--Congresses.
Sociology--Philosophy--Congresses
Princeton subject headings:
Simmel, Georg, 1858-1918. Soziologie--Congresses.
Sociology--Congresses.
Sociology--Germany--History--Congresses.
Sociology--Philosophy--Congresses.