@book { DasPortrteinesReformators,
    title = "Das Porträt eines Reformators",
    author = "Ferdinand {Ahuis}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0259-8",
    url = "https://www.peterlang.com/document/1052395"
}