@book { RelationshipMarketingfrKinderundJugendlichebeiFuballBundesligavereinen,
    title = "Relationship Marketing für Kinder und Jugendliche bei Fußball-Bundesligavereinen",
    author = "Tobias {Redeker}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832470418",
    url = "https://m.diplom.de/document/222363"
}