@book { DasBerufsfeldControllinginDeutschlandunddenUSA,
    title = "Das Berufsfeld 'Controlling' in Deutschland und den USA",
    author = "Bianca {Beckers}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836631990",
    url = "https://m.diplom.de/document/226990"
}