@book { DieErlebnisvermittlungdurchMarketingEvents,
    title = "Die Erlebnisvermittlung durch Marketing-Events",
    author = "Volker {Hartig}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832413088",
    url = "https://m.diplom.de/document/217218"
}