@book { TheMediumInternetHarmingorPromotingSocialCapital,
    title = "The Medium Internet – Harming or Promoting Social Capital?",
    author = "",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640964567",
    url = "https://www.hausarbeiten.de/document/175314"
}