@book { WilhelmWeitling18081871,
    title = "Wilhelm Weitling (1808–1871)",
    subtitle = "Eine politische Biographie- Teil 1 und Teil 2",
    author = "Waltraud {Seidel-Höppner}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1459216"
}