@book { TheimpactofastrongglobalEmployerBrandinthewarfortalent,
    title = "The impact of a strong global Employer Brand in the war for talent",
    author = "Romy {Kupfernagel}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836640015",
    url = "https://m.diplom.de/document/227458"
}