Columbia subject headings:
Harvard subject headings:
Luhmann, Niklas, 1927-1998
Nietzsche, Friedrich Wilhelm, 1844-1900
Philosophy--History
Social systems--History.
Sociology--Philosophy--History
Princeton subject headings:
Luhmann, Niklas, 1927-1998.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Philosophy--History.
Social systems--History.
Sociology--Philosophy--History.