@book { MglichkeitenderKundenakquisitionberdasInternet,
    title = "Möglichkeiten der Kundenakquisition über das Internet",
    author = "Oliver {Queck}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832403317",
    url = "https://m.diplom.de/document/216314"
}