@book { DigitaleMarktpltzeB2BundB2C,
    title = "Digitale Marktplätze. B2B und B2C",
    author = "Christian {Dreeser} and Christian {Ulrich}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638540155",
    url = "https://www.hausarbeiten.de/document/60307"
}