@book { KircheundStaatimDenkendesfrhenChristentums,
    title = "«Kirche und Staat» im Denken des frühen Christentums",
    author = "Adolf Martin {Ritter}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1100457"
}