@book { BowlingOnlineSozialkapitalimInternet,
    title = "Bowling Online - Sozialkapital im Internet",
    author = "Sophia {von Berg}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656197898",
    url = "https://www.hausarbeiten.de/document/194506"
}