@book { Africasplaceintheinternationalfootballsystem,
    title = "Africa’s place in the international football system",
    author = "Mark-Marcel {Müller}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640159093",
    url = "https://www.hausarbeiten.de/document/115101"
}