@book { Machtfragen,
    title = "Machtfragen",
    subtitle = "Die Entstehung der Verfassung für das Land Nordrhein-Westfalen 1946-1950",
    author = "Wolfgang {Kringe}",
    year = "1988",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1075745"
}