@book { DassteinerneHerzInEinfacherSprache,
    title = "Das steinerne Herz: In Einfacher Sprache",
    author = "E. T. A. {Hoffmann} and André {Graf}",
    year = "2024",
    publisher = "adlima GmbH",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1489038"
}