@book { ZugngezuMartinLuther,
    title = "Zugänge zu Martin Luther",
    author = "Reinhard {Wunderlich} and Bernd {Feininger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1084867"
}