@book { FruleinFriedaunddieToteinderBadewanne,
    title = "Fräulein Frieda und die Tote in der Badewanne",
    author = "Livia {Keltis}",
    year = "2023",
    publisher = "Bildung & Geschichte(n)",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1362715"
}