@book { Web20UserGeneratedContentinOnlineCommunities,
    title = "Web 2.0: User-Generated Content in Online Communities",
    author = "Timo {Beck}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836604925",
    url = "https://m.diplom.de/document/228981"
}