@book { EngelimWorldWideWeb,
    title = "Engel im World Wide Web",
    author = "Stefan {Grzesikowski}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638562645",
    url = "https://www.hausarbeiten.de/document/63149"
}