@book { ReligionspdagogikimWiderstreit,
    title = "Religionspädagogik im Widerstreit",
    author = "Helmut {Schirmer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107657"
}