@book { DieFuballBundesligaim21Jahrhundert,
    title = "Die Fußball-Bundesliga im 21. Jahrhundert",
    author = "Philipp {Eisenberger}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832491994",
    url = "https://m.diplom.de/document/224325"
}