@book { ImAuftragdesWeihnachtsmanns,
    title = "Im Auftrag des Weihnachtsmanns",
    author = "Hanna {Julian}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1416989"
}