@book { VerwandlungdesMenschenVergeistigungderWelt,
    title = "Verwandlung des Menschen - Vergeistigung der Welt",
    author = "Kai {Liedtke}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/217421"
}