@book { MusikimInternetMP3,
    title = "Musik im Internet: MP3",
    subtitle = "Empirische Befunde und motivationstheoretische Rechtfertigung",
    author = "Dirk {Lang}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832426569",
    url = "https://m.diplom.de/document/217884"
}