@book { DieProcurementBalancedScorecard,
    title = "Die Procurement-Balanced Scorecard",
    author = "Christian {Schlachter}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836609470",
    url = "https://m.diplom.de/document/225574"
}