@book{Luhmann_1998,
 author = {Luhmann, Niklas},
 year = {1998},
 title = {Die Wissenschaft der Gesellschaft},
 url = {https://steffenroth.files.wordpress.com/2012/03/wissenschaft-der-gesellschaft-niklas-luhmann.pdf},
 address = {Frankfurt am Main},
 urldate = {2015-05-16},
 edition = {3},
 publisher = {{Suhrkamp Verlag}}
}