@book { DasSponsoringvonOlympischenSpielenalsMarketingInstrument,
    title = "Das Sponsoring von Olympischen Spielen als Marketing-Instrument",
    author = "Kirsten {Klatt}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434076",
    url = "https://m.diplom.de/document/219081"
}