@book { EinSommeraufderHalligOland,
    title = "Ein Sommer auf der Hallig - Oland",
    author = "Lotta {Larsson}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1397598"
}