@book { DatabaseMarketingimFinanzdienstleistungssektor,
    title = "Database Marketing im Finanzdienstleistungssektor",
    author = "Nadine {geb. Schumacher}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832441166",
    url = "https://m.diplom.de/document/219740"
}