@book { KarlderGroeKaiserwiderWillen,
    title = "Karl der Große -  Kaiser wider Willen?",
    author = "Christina {Eggers}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638431057",
    url = "https://www.hausarbeiten.de/document/45757"
}