@book { DasWerbegeschenkalsMarketingproblem,
    title = "Das Werbegeschenk als Marketingproblem",
    author = "Rainer {Bose}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832426651",
    url = "https://m.diplom.de/document/217891"
}