@book { MarkenbewertungundBrandScorecard,
    title = "Markenbewertung und Brand Scorecard",
    author = "Willem {Spelten}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832455880",
    url = "https://m.diplom.de/document/221075"
}