@book { GesundheitsratgeberFettleber,
    title = "Gesundheitsratgeber Fettleber",
    author = " {Deutsche Leberhilfe e.V}",
    year = "2017",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/404051"
}