@book { MigrationundBeschftigung,
    title = "Migration und Beschäftigung",
    author = "Ulrich {Kuschnereit}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832433789",
    url = "https://m.diplom.de/document/219054"
}