@book { WieWeb20diePolitikverndert,
    title = "Wie Web 2.0 die Politik verändert",
    subtitle = "Der Online-Wahlkampf hat begonnen",
    author = "Samuel {Ernst}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842805514",
    url = "https://m.diplom.de/document/228082"
}