@book { Sporteventsponsoring, title = "Sporteventsponsoring", subtitle = "Rahmenbedingungen - Wirkung - Kontrolle", author = "Petra {Mathi}", year = "2001", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783832443313", url = "https://m.diplom.de/document/219931" }