@book { KundenbindungimeCommerce,
    title = "Kundenbindung im eCommerce",
    author = "Christian {Löckenhoff}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832446338",
    url = "https://m.diplom.de/document/220243"
}