@book { DasGeheimnisderverdorrtenRosen,
    title = "Das Geheimnis der verdorrten Rosen",
    author = "Paul {Riedel}",
    year = "2017",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/999487"
}