@book { DemographievonMigranteninDeutschland,
    title = "Demographie von Migranten in Deutschland",
    author = "Martin {Kohls}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01794-6",
    url = "https://www.peterlang.com/document/1047235"
}