@book { HerrschaftundIslam,
    title = "Herrschaft und Islam",
    author = "Assem {Hefny}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03608-4",
    url = "https://www.peterlang.com/document/1046515"
}