@book{Simmel+2021,
url = {https://doi.org/10.3790/9783428577125},
title = {Über sociale Differenzierung},
title = {Sociologische und psychologische Untersuchungen. (Staats- und socialwissenschaftliche Forschungen X.1)},
author = {Georg Simmel},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428577125},
isbn = {9783428577125},
year = {1890},
lastchecked = {2021}
}