@book { SocialCommercedeutsch,
    title = "Social Commerce (deutsch)",
    author = "Paul {Marsden}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640646357",
    url = "https://www.hausarbeiten.de/document/147182"
}