@book { DerWestflischeFriedenvon1648,
    title = "Der Westfälische Frieden von 1648",
    author = "Mathias {Dittrich}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638313971",
    url = "https://www.hausarbeiten.de/document/30040"
}