Columbia subject headings:
Culture--Congresses.
Luhmann, Niklas, 1927-1998--Congresses.
System theory--Congresses.
Harvard subject headings:
Culture--Congresses.
Luhmann, Niklas, 1927-1998--Congresses.
System theory--Congresses
Princeton subject headings:
Culture--Congresses.
Luhmann, Niklas, 1927-1998--Congresses.
System theory--Congresses.