@book { MarketingineinerTransitionalEconomy,
    title = "Marketing in einer Transitional Economy",
    author = "Sabina {Kusmin}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836611732",
    url = "https://m.diplom.de/document/225707"
}