@book { HerzklopfenimHerbst,
    title = "Herzklopfen im Herbst",
    subtitle = "Lebenslust zählt nicht die Jahre",
    author = "Peter {Jäger}",
    year = "2019",
    publisher = "Bedey Media GmbH",
    address = "Hamburg, Deutschland",
    url = "https://kaderaverlag.openpublishing.com/document/507048"
}