@book { DieKanonenvonSaintMarcouf,
    title = "Die Kanonen von Saint Marcouf",
    author = "Helmut K {von Keusgen}",
    year = "2024",
    publisher = "EK-2 Publishing",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1459366"
}