@book { DieEntstehungdesGeldes,
    title = "Die Entstehung des Geldes",
    author = "Claudia {Steinwender}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832495862",
    url = "https://m.diplom.de/document/224494"
}