@book { VirtuelleRealittimMarketing,
    title = "Virtuelle Realität im Marketing",
    author = "Rüdiger {Traub} and Helge {Hirsch}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832423629",
    url = "https://m.diplom.de/document/218176"
}