@book { TakisEngelgeschichtenEineWeihnachtsreise,
    title = "Takis Engelgeschichten: Eine Weihnachtsreise",
    author = "Marie-Sara {Keil}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1007703"
}