@book { KarlKautskySeineAuffassungenzurpolitischenDemokratie,
    title = "Karl Kautsky. Seine Auffassungen zur politischen Demokratie",
    author = "Beate {Häupel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1081677"
}