@book { Audiopostproduktion,
    title = "Audiopostproduktion",
    subtitle = "Die Technik und Arbeit in professionellen Projektstudios",
    author = "D. {Heer}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836645324",
    url = "https://m.diplom.de/document/227346"
}