@book { EinsatzpotenzialevirtuellerWeltenfrdasMarketing,
    title = "Einsatzpotenziale virtueller Welten für das Marketing",
    author = "Michael {Neumann}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836609289",
    url = "https://m.diplom.de/document/225563"
}