@book { DasLeberBuch,
    title = "Das Leber-Buch",
    author = " {Deutsche Leberstiftung} and und Bianka {Wiebner}",
    year = "2021",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1108904"
}