@book { InternationaleMigrationalsglobaleHerausforderung,
    title = "Internationale Migration als globale Herausforderung?",
    author = "Esther {Bückmann}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638589628",
    url = "https://www.hausarbeiten.de/document/66315"
}