@book { VermarktungvonBasketball,
    title = "Vermarktung von Basketball",
    author = "Alexander {Yankulin}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836602853",
    url = "https://m.diplom.de/document/228834"
}