@book { MessungderMarkenstrkevonRetailBrands,
    title = "Messung der Markenstärke von Retail Brands",
    author = "Manuel {Bahnsen}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225097"
}