@book { DifficultNormativity,
    title = "Difficult Normativity",
    subtitle = "Normative Dimensions in Research on Religion and Theology",
    author = "Jan-Olav {Henriksen}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108282"
}