@book { DieBalancedScorecardinDienstleistungsunternehmen,
    title = "Die Balanced Scorecard in Dienstleistungsunternehmen",
    author = "Stefan {Schulze}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640453672",
    url = "https://www.hausarbeiten.de/document/136879"
}