@book { DieVermarktungvonBurgenamBeispielderBurgDreieichenhain,
    title = "Die Vermarktung von Burgen am Beispiel der Burg Dreieichenhain",
    author = "Janet {Meier}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225154"
}