@book { BalancedScorecardimMarketing,
    title = "Balanced Scorecard im Marketing",
    author = "Sonja {Stoll, geb. Weisser}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832472528",
    url = "https://m.diplom.de/document/222555"
}