@book { WettbewerbsanalysefrdasWeinanbaugebietFranken,
    title = "Wettbewerbsanalyse für das Weinanbaugebiet Franken",
    author = "Reiner {Bell}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/226687"
}