@book { DieLandfriedensbewegungimMittelalter,
    title = "Die Landfriedensbewegung im Mittelalter",
    author = "Maike {Berhorst}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638812689",
    url = "https://www.hausarbeiten.de/document/76732"
}