Columbia subject headings:
Luhman, Niklas.
Science--Philosophy.
System theory.
Harvard subject headings:
Luhmann, Niklas, 1927-1998
Luhmann, Niklas, 1927-1998--Dictionaries.
Science--Philosophy
Social systems--Dictionaries.
Sociology--Dictionaries
System theory
Princeton subject headings:
Dictionaries.
Luhmann, Niklas, 1927-1998--Dictionaries--German.
Luhmann, Niklas, 1927-1998.
Social systems.
Sociology--Dictionaries--German.