@book { FinanzdienstleistungenimInternet,
    title = "Finanzdienstleistungen im Internet",
    author = "Mustafa {Sener}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832465872",
    url = "https://m.diplom.de/document/221978"
}