Columbia subject headings:
Autopoiesis.
Luhmann, Niklas, 1927-1998. Soziale Systeme.
Social structure.
Social systems.
Harvard subject headings:
Luhmann, Niklas, 1927-1998. Soziale Systeme.
Social systems.
Princeton subject headings:
Autopoiesis.
Luhmann, Niklas, 1927-1998.
Social systems.