@book { DerdeutscheTVMarktimWandel,
    title = "Der deutsche TV-Markt im Wandel",
    author = "Bartosz {Mazur}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656177289",
    url = "https://www.hausarbeiten.de/document/192143"
}