@book { LeckerohneFett,
    title = "Lecker ohne ... Fett",
    author = "Alexandra {Hirschfelder} and Sabine {Offenborn}",
    year = "2016",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/404038"
}