@book { DieBekmpfungderKatharerdurchInnozenzIIIinSdfrankreich,
    title = "Die Bekämpfung der Katharer durch Innozenz III. in Südfrankreich",
    author = "Katrin {Kuznik}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640324279",
    url = "https://www.hausarbeiten.de/document/126516"
}