@book { SponsoringinKleinundKleinstunternehmen,
    title = "Sponsoring in Klein- und Kleinstunternehmen",
    author = "Andreas {Will}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225345"
}