@book { ControllingimWandelderZeit,
    title = "Controlling im Wandel der Zeit",
    author = "Kirsten {Dettmer}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832471293",
    url = "https://m.diplom.de/document/222443"
}