@incollection { Tönnies1927,
title = {Demokratie },
author = {Tönnies, Ferdinand and Kelsen, Hans },
pages = {12-68 },
year = {1927 },
publisher = {Mohr Siebeck },
url = {http://nbn-resolving.de/urn:nbn:de:0168-ssoar-190169 },
}