@book { DasGeheimnisvonGisors,
    title = "Das Geheimnis von Gisors",
    author = "Marc {Debus}",
    year = "2016",
    publisher = "Schreibstark-Verlag",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1014873"
}