@book { WisdomfromtheEuropeanMiddleAges,
    title = "Wisdom from the European Middle Ages",
    author = "Albrecht {Classen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b19218",
    url = "https://www.peterlang.com/document/1163747"
}