@book { OutsourcinginderBauindustrie,
    title = "Outsourcing in der Bauindustrie",
    subtitle = "Status quo und Trends",
    author = "Eveline {Seiringer}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832418199",
    url = "https://m.diplom.de/document/217674"
}