@book { PreMarketingviaklassischerMarktkommunikationsmittel,
    title = "Pre-Marketing via klassischer Marktkommunikationsmittel",
    author = "Diethard {Forster}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434434",
    url = "https://m.diplom.de/document/219111"
}