@book { ZurckzumMittelalter,
    title = "Zurück zum Mittelalter",
    author = "Nine {Miedema} and Andrea {Sieber}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03194-2",
    url = "https://www.peterlang.com/document/1046119"
}