@book { DasFeindbildderKreuzzugslyrik,
    title = "Das Feindbild der Kreuzzugslyrik",
    author = "Ingrid {Hartl}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1104194"
}