@book { VariationendesChristseinsWegedurchdieKirchengeschichte,
    title = "Variationen des Christseins – Wege durch die Kirchengeschichte",
    author = "Reinhard {Wunderlich} and Bernd {Feininger}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101194"
}