@book { StrategischePlanungimECommerce,
    title = "Strategische Planung im E-Commerce",
    author = "Daniel {Bopp}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638145299",
    url = "https://www.hausarbeiten.de/document/7201"
}