@book { KooperationzwischenSchuleundSportverein,
    title = "Kooperation zwischen Schule und Sportverein",
    author = "Thomas  {Huber}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656565000",
    url = "https://www.hausarbeiten.de/document/266492"
}