@book { GewissheitenimWandel,
    title = "Gewissheiten im Wandel",
    author = "Christa {Bertelsmeier-Kierst}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16498",
    url = "https://www.peterlang.com/document/1058399"
}