@book { SportmarketingimFuballamBeispieldesFCBayernMnchen,
    title = "Sportmarketing im Fußball am Beispiel des FC Bayern München",
    author = "Marcel {Ruhm}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656348061",
    url = "https://www.hausarbeiten.de/document/207481"
}