@book { GuerillaMarketingundViralesMarketing,
    title = "Guerilla Marketing und Virales Marketing",
    subtitle = "Alternativen zur klassischen Werbung?",
    author = "Regina {Kutzborski}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Germany",
    url = "https://m.diplom.de/document/228982"
}