Columbia subject headings:
Elias, Norbert, 1897-1990.
Mannheim, Karl, 1893-1947.
Sociology--Methodology.
Sociology--Philosophy.
Harvard subject headings:
Sociology.
Princeton subject headings:
Elias, Norbert, 1897-1990.
Habermas, Jürgen.
Luhmann, Niklas, 1927-1998.
Sociology--Germany.
Sociology.