@book { AnreizeimProfifussball,
    title = "Anreize im Profifussball",
    author = "Jan {Schmitt}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836603881",
    url = "https://m.diplom.de/document/228920"
}