@book { NichtetabliertechristlicheParteien,
    title = "Nichtetablierte christliche Parteien",
    author = "Guido {Hoyer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1092315"
}