@book { DerMenschdesDienstesbeiFethullahGlen,
    title = "Der «Mensch des Dienstes» bei Fethullah Gülen",
    author = "Muhammed Mustafa {Akdag}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03777-7",
    url = "https://www.peterlang.com/document/1047926"
}