@book{Luhmann_1997,
 author = {Luhmann, Niklas},
 year = {1997},
 title = {Die Gesellschaft der Gesellschaft},
 address = {Frankfurt am Main},
 volume = {1},
 publisher = {{Suhrkamp Verlag}},
 isbn = {9783518582473},
 series = {Suhrkamp-Taschenbuch Wissenschaft}
}