@book { CustomerRelationshipMarketinginderLuxusgterindustrie,
    title = "Customer Relationship Marketing in der Luxusgüterindustrie",
    author = "Alice {Haupt}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832498948",
    url = "https://m.diplom.de/document/225011"
}