@book { ValueAddedServicesinderAutomobilbranche,
    title = "Value-Added Services in der Automobilbranche",
    author = "Ramon Thomas {Kunke}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832431853",
    url = "https://m.diplom.de/document/218879"
}