@book { BotenimfrhenMittelalter,
    title = "Boten im frühen Mittelalter",
    author = "Volker {Scior}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18153",
    url = "https://www.peterlang.com/document/1111904"
}