@book { ExaminingExpatriation,
    title = "Examining Expatriation",
    author = "Astrid Susanne {Lang}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832472320",
    url = "https://m.diplom.de/document/222536"
}