@book { EntwicklungeinesSystemsderMarketingstrategien,
    title = "Entwicklung eines Systems der Marketingstrategien",
    author = "Klaus-Steffen {Priemer}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832406547",
    url = "https://m.diplom.de/document/216584"
}