@book { PolitischhistorischeSchriftenBriefeundAkten,
    title = "Politisch-historische Schriften, Briefe und Akten",
    author = "Helmut {Reinalter}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095073"
}