@incollection { Hartmann1923,
 title = {Zur Soziologie der Revolution : Korreferat},
 author = {Hartmann, Ludo Moritz},
 pages = {24-39},
 year = {1923},
 publisher = {Mohr Siebeck},
 url = {http://nbn-resolving.de/urn:nbn:de:0168-ssoar-190155},
}