@book { KircheZeichendesHeilsSteindesAnstoes,
    title = "Kirche: Zeichen des Heils – Stein des Anstoßes",
    author = "Willibald {Sandler} and Andreas {Vonach}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097879"
}