@book { DatabaseMarketingimLadeneinzelhandel,
    title = "Database Marketing im Ladeneinzelhandel",
    author = "Stéphane {Müller}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832402662",
    url = "https://m.diplom.de/document/216253"
}