@book { LeistungsgesellschaftundDoping,
    title = "Leistungsgesellschaft und Doping ",
    author = "Mario {Stenz}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640451777",
    url = "https://www.hausarbeiten.de/document/137091"
}