@book { DieSustainabilityBalancedScorecard,
    title = "Die Sustainability Balanced Scorecard",
    author = "Nicole {Hung}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832474799",
    url = "https://m.diplom.de/document/222745"
}