@incollection { Tönnies1931,
 title = {Soziographie},
 author = {Tönnies, Ferdinand},
 pages = {196-206},
 year = {1931},
 publisher = {Mohr Siebeck},
 url = {http://nbn-resolving.de/urn:nbn:de:0168-ssoar-188145},
}