@book { SpiegelglasUnheimlicheGeschichten,
    title = "Spiegelglas – Unheimliche Geschichten",
    author = "Michael {Siefener}",
    year = "2023",
    publisher = "Bärenklau Exklusiv",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1363985"
}