@book { UnternehmenimWandeldesOutsourcing,
    title = "Unternehmen im Wandel des Outsourcing",
    author = "Denis {Löffler}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832486341",
    url = "https://m.diplom.de/document/223828"
}