@book { TwitteringtheArabspringAnEmpiricalContentAnalysisofTweets,
    title = "Twittering the #Arabspring? An Empirical Content Analysis of Tweets",
    author = "Johannes {Sieben}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/312660"
}