@book { SponsoringWerdieWahlhat,
    title = "Sponsoring - 'Wer die Wahl hat …'",
    author = "Björn {Benz}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836642941",
    url = "https://m.diplom.de/document/227617"
}