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@book{ Tönnies1931,
 title = {Einführung in die Soziologie},
 author = {Tönnies, Ferdinand},
 year = {1931},
 pages = {XX, 327},
 address = {Stuttgart},
 publisher = {Enke},
 urn = {https://nbn-resolving.org/urn:nbn:de:0168-ssoar-50771-3},
}