Biblio
Zur Theorie Sozialer Systeme (Opladen: Westdeutscher Verlag, 1976)
, “Introduction”, in The American University, , The American University, 2nd edn (Cambridge, Mass.: Harvard University Press, 1974), pp. 1–32
, “Introduction”, in The American University, , The American University, 2nd edn (Cambridge, Mass.: Harvard University Press, 1974), pp. 1–32
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