@book { Euromanagement,
    title = "Euromanagement",
    author = "Elke {David, geb. Diefenbach}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832418519",
    url = "https://m.diplom.de/document/217702"
}