@book { MERCOSUR,
    title = "MERCOSUR",
    subtitle = "Konzept, Entwicklung und Perspektiven",
    author = "Margarete {Dabrowski}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/216458"
}