@book { ElectronicCommerceimBusinessToConsumerBereich,
    title = "Electronic Commerce im Business-To-Consumer-Bereich",
    author = "Markus {Arend}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832429843",
    url = "https://m.diplom.de/document/218706"
}