@book { KommunikationimInternet,
    title = "Kommunikation im Internet",
    author = "Georg {Knobloch}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832467494",
    url = "https://m.diplom.de/document/222121"
}