@book { BestAgerBestTargets,
    title = "Best Ager=Best Targets?",
    subtitle = "Kritische Betrachtung der Zielgruppe 50plus für das Marketing",
    author = "Yvonne {Senf}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836610742",
    url = "https://m.diplom.de/document/225647"
}