@book { CustomerRelationshipMarketingmitHilfedesInternets,
    title = "Customer Relationship Marketing mit Hilfe des Internets",
    author = "Imke {Jaenicke}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832469504",
    url = "https://m.diplom.de/document/222283"
}