@book { BankenundOnlineDienste,
    title = "Banken und Online-Dienste",
    author = "Christian {von Thaden}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832438104",
    url = "https://m.diplom.de/document/219487"
}