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1) Amery, Jean: Über das Altern. Stuttgart: Ernst Klett Verlag 1968.
2) Bodenheimer, Aron R.: Warum? Von der Obszönität des Fragens. Stuttgart: Reclam 1984.
3) Foerster, Heinz von: Cybernetics of Cybernetics. In: Krippendorff, Klaus (ed.): Communication And Control In Society. New York, ...: Gordon And Breach Science Publishers 1974. See also his many other works.
4) Glasersfeld, Ernst von: Radical Constructivism. A way of Knowing and Learning. London: Falmer Press 1995. See also his many other works.
5) Grün, Anselm: Anspruch des Schweigens. Münsterschwarzach: Vier-Türme-Verlag 1980.
6) Hume, David: An Enquiry Concerning Human Understanding. P.F. Collier & Son, Harvard Classics Volume 37, 1910.
7) Laertius, Diogenes: The Lives And Opinions Of Eminent Philosophers. Book VI. London: Henry G. Bohn, 1853.
8) Luhmann, Niklas; Fuchs, Peter: Reden und Schweigen. Frankfurt am Main: Suhrkamp Verlag 1989.