@book { VereineundnationaleBewegunginBreslau18301871,
    title = "Vereine und nationale Bewegung in Breslau 1830–1871",
    author = "Christian {Gürtler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096169"
}