Columbia subject headings:
Luhmann, Niklas, 1927-1998.
Sociology.
Weber, Max, 1864-1920.
Harvard subject headings:
Luhmann, Niklas, 1927-1998
Sociology.
Weber, Max, 1864-1920.
Princeton subject headings:
Luhmann, Niklas, 1927-1998.
Sociology.
Weber, Max, 1864-1920.