@book { MakeandBuyEntscheidungeninderMedienbranche,
    title = "Make-and-Buy-Entscheidungen in der Medienbranche",
    author = "Dirk {Altenwerth}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832495435",
    url = "https://m.diplom.de/document/224669"
}