@book { DieVisiondesMnchsJohannesvonLttich,
    title = "Die Vision des Mönchs Johannes von Lüttich",
    author = "Rachel {Gellert}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18063",
    url = "https://www.peterlang.com/document/1111629"
}