@book { MglichkeitenundGrenzendesindividuellenKundenmarketing,
    title = "Möglichkeiten und Grenzen des individuellen Kundenmarketing",
    author = "Thomas {Böhnke}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434816",
    url = "https://m.diplom.de/document/219147"
}