@book { DatenschutzimInternet,
    title = "Datenschutz im Internet",
    author = "Katharina {Mittler}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656410652",
    url = "https://www.hausarbeiten.de/document/212688"
}