@book { DasInternetalsneuesinnovativesToolimMarketing,
    title = "Das Internet als neues, innovatives Tool im Marketing",
    author = "Jan {Vorwerk}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832408084",
    url = "https://m.diplom.de/document/216713"
}