@book { IntegrationspotentialevonCustomerRelationshipManagementinsControlling,
    title = "Integrationspotentiale von Customer Relationship Management ins Controlling",
    author = "Ulrike {Egger}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832483883",
    url = "https://m.diplom.de/document/223577"
}