@book { WirkungsforschungimSportSponsoring,
    title = "Wirkungsforschung im Sport-Sponsoring",
    author = "Claudia {Faika}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832449049",
    url = "https://m.diplom.de/document/220473"
}