@book { VomJunkerzumBrger,
    title = "Vom Junker zum Bürger",
    subtitle = "Hellmut von Gerlach - Demokrat und Pazifist in Kaiserreich und Republik",
    author = "Christoph {Koch}",
    year = "2009",
    publisher = "Meidenbauer",
    address = ", Germany",
    url = "https://www.peterlang.com/document/1107455"
}