@book { SocialMediaandLuxuryBrands,
    title = "Social Media and Luxury Brands",
    author = "",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656287049",
    url = "https://www.hausarbeiten.de/document/202609"
}