@book { TheorienzumInternet,
    title = "Theorien zum Internet",
    subtitle = "Ein systematischer Abriss",
    author = "Jörg {Behnke}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/220916"
}