@book { koMarketingstrategiendeskonventionellenHandels,
    title = "Öko-Marketingstrategien des konventionellen Handels",
    author = "Anja {Richter}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832454982",
    url = "https://m.diplom.de/document/220808"
}