@book { DasMitmachInternetWeb20,
    title = "Das Mitmach-Internet Web 2.0",
    author = "Johannes Wilhelm {Eßer}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656087915",
    url = "https://www.hausarbeiten.de/document/184175"
}