Columbia subject headings:
Communication--Philosophy.
Communication--Social aspects.
Ethics, Modern--20th century.
Luhmann, Niklas.
Harvard subject headings:
Communication--Philosophy
Communication--Social aspects
Ethics, Modern--20th century.
Luhmann, Niklas, 1927-1998
Princeton subject headings:
Communication--Philosophy.
Communication--Social aspects.
Ethics, Modern--20th century.
Luhmann, Niklas, 1927-1998.