@book { DieBalancedScorecard,
    title = "Die Balanced Scorecard",
    author = "Detlef {Fitzner}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836602983",
    url = "https://m.diplom.de/document/228843"
}